The team investigates a missing woman's boyfriend, with whom she lived. However, they determine that he has a twin brother and quickly turn their attention to him.

The team searches for a mother and her two children, who are last seen boarding a yacht which is later found adrift in New York's Harbor with only its dead captain aboard. Meanwhile, Malone gets ready to leave the team and move with his family to Chicago.

Chet Collins has been searching for his son since the boy was kidnapped four years earlier on a camping trip, and is the one case that Jack has never been able to forget. When Chet disappears, leaving behind only his wedding ring and the mountains of debt he had accumulated in his search, Jack will go to any lengths to find Collins and save him from himself.

When a father who goes missing while trying to prove that his son a death-row inmate who is scheduled to die in two days is innocence, The past 11 years of the missing Mans life have been devoted to proving that his son, was wrongly convicted of killing a young married couple in front of their daughter during a convenience story robbery. While the team does not rule out that the despondent man could have brought harm upon himself, the team members find themselves wondering if the man is right about his son innocence.

The team searches for a recently blinded girl and her companion who disappeared during a camping trip. Vivian takes over as the supervisor, while Jack struggles to say goodbye to his family.

When Mac, a prisoner only two weeks from parole, disappears during a fight in the yard along with another prisoner, his sister contacts the FBI for help. No one can figure out why a member of the Aryan gang would escape with a black prisoner. While Martin and Viv talk to the other prisoners and Jack tries to wade his way through the sister's lies and half-truths where her brother is concerned, Danny focuses on a new prisoner who Mac had been protecting.

A rising exec is abducted from a Taxi after attending a rooftop party. The team also continues to learn to adjust with their new boss.

The team believes that the past of a missing psychologist's brother might have played a role in his disappearance. Martin's relationship with Kim takes a spicy turn.

Patrick Kent, a Vice-President of a New York investment-banking firm, vanishes from a San Diego airport, only leaving behind two empty suitcases.

When the team searches whether foul play was involved in the adoption of a 16-year-old girl who went missing back in 1991 shows up at the FBI offices with an article she found online, which makes her believe she was kidnapped as a young child. Meanwhile, Jack tells the team he's moving to Chicago with his family.

After telling his mother, he wanted to leave school for good, seventeen year old Andy Deaver vanishes from his private boarding school, last seen by it's headmaster, Graham Spaulding.

While working on a high profile civil case, a trial consultant vanishes. Jack and Sam learn how to make adjustments as Brian and Finn spend more time together.

The team must shift their attention from a case they are working on and hand it over to Martin, after a child is reported to have been kidnapped at a mall.

Jack and the team search for a pregnant woman, Kathy Dobson, who disappeared from a hospital before being told that she has serious complications. As the detectives race against time to find Kathy, their investigation gradually reveals that Kathy's seemingly happy life actually hasn't been going very well. She is eight-and-a-half months pregnant and, under the tight control of her husband Paul, has withdrawn from her family and friends. Paul's brother Ritchie, who has been following Kathy and providing Paul with addresses she visits, lists a woman who may be affiliated with an ""underground railroad"" that helps battered women. When the team members find the woman, they learn that she has been assaulted by Paul—but she still refuses to lead them to Kathy.

When the team tries to plot a strategy after they find out that Samantha has been shot and that she might be critically injured in the hostage crisis situation. Jack makes a deal with Berry so that Sam can get help and Jack goes in there and takes Sam's place.

The team searches for a man who goes missing after leaving his wife's hair salon to deposit the day's earnings following an argument with her. Meanwhile, Danny resists getting pulled back into the life of his convict brother who is up for parole, and Martin's impending firearms qualifications test dredges up unsettling memories for him.

With the aftershocks of Sept. 11 and man named Barry , who lost his wife that day and then his job soon after. The man lashes out at her former boss an employment-agency owner. Blaming her for his wife's death and his own failure to find a job, Barry kidnaps the woman for ransom.Then he demands the money be exchanged at a bookstore, but when the cash is delivers Berry is provoked and takes the store's patrons hostage. Among them is Samantha,and given Jack's affection for her complicates the negotiations.

The suspect list keeps growing as the team investigates the disappearance of a Russian matchmaker.

The team investigates when Aaron Gibbs ends up missing one night and soon learn that he had been lying to his wife about quitting his job, and had been working nights in a fight club. During the course of the investigation, Jack and the others learn that Aaron's disappearance was connected to events that took place during Hurricane Katrina, when Aaron was fighting to save his sons, and follow the trail of evidence, believing that the events of that night in New Orleans hold the key to finding the truth about the missing man.

After attorney Jennifer Nichols disappears, the team investigates the last few days in her life and soon find that she had grown disillusioned with her most recent relationship with Allen Davis. Discussions with a married ex-lover reveal that Nichols had recently gone through an old case file relating to a ten-year-old bank robbery, which has a connection to her recent relationship. Jack and Ann avoid discussing a recent development in their relationship -- her pregnancy.

When a homeless woman disappears from a shelter, the team is forced to re-examine the case of twin brothers Greg and Rick Knowles. Five months earlier (Doppelganger), Greg Knowles had confessed to a series of brutal murders, but the team was always convinced that it was Rick who had actually performed the killings. When Greg is released from jail and exonerated of the crimes, the team has to work against the clock to prove that Rick is the guilty party and to save one twin from the other.

Jack and the team investigate when Sadik Marku's son goes missing along with the boy's mother, and Samantha worries that Jack is more interested in settling an old score with Marku than with finding the missing woman and boy.

The team uncovers a history of deception as they search for a man posing as a college student vanishes.

A young mother disappears after leaving her three year old son with a babysitter.

When Ian Norville disappears on a field trip to a museum in Manhattan, the team gets involved, but it isn't long before Jack turns his suspicion to his father, Daniel, who soon admits that he didn't take the necessary precautions with his son, who happens to be autistic.

A 12 year old boy (Jake Thomas) goes missing. The team discovers that the boy had a rough 24 hours leading up to his disappearance. He disappeared in the middle of the school day, the only clues a broken miror, a discarded hall pass, and blood on the wall....until a picture of him is sent around the school.

The team investigates the disappearance of social worker Eric Hayes, who had given thirty days notice to his job not long before. When their investigation leads them to a young pregnant woman who had already lost one child to the system, the agents begin to believe the disillusioned social worker may have been having an affair but soon discover that he may have been trying to right the wrong that drove him from his job. Danny has trouble with the investigation, as it reminds him of his own experience in foster care. Jack confides in Samantha about his relationship with Ann, but it may be too late.

Jack goes missing after taking a case into his own hands which soon becomes intertwined with a human trafficking prostitution case that Vivian is working on.

Four different witnesses claim that a woman was abducted from a mall parking lot while her husband was standing just yards away with his back turned to her.

The team searches for Ted Jordano and his teenage children after the three turn up missing and their house is a veritable bloodbath.

After therapist Gina Hill disappears, the team investigates and initially suspects that one of her patients may be involved. After discussions with Gina's fiancé and her own therapist, the team follows the trail of clues to a bartender named Vince with an unusual ability to get good women to do whatever he wants them to. Martin continues to struggle with his recovery.

The team searches for Jessica, a 911 operator who disappeared after a man called and asked for her by name.

A white-collar criminal goes missing on his way to testify against a former associate and the team must find out why.

Max Cassidy vanishes after leaving a message on his wife's voicemail, with both Jack and Ann frantic to find him. While investigating, Jack realises that Max was having an affair, and that he's gotten much deeper into a case than he should have following the murder of his partner, Jimmy, a man Max had felt was too green for undercover work. Both Jack and Ann fear the worst as the team tries to hunt down Max.

To find a missing young mother who was recruited as a drug mule, Samantha goes undercover to lure the drug trafficker who recruited the young woman.

After a young woman named Agnes Deschamps goes missing, the team takes a look into her disappearance and learns that the young woman was believed to be a psychic. Sam has trouble accepting that one of their witnesses purports to be a psychic, although she is thrown when the woman correctly points out her problems with Martin. Jack, Martin and Danny pick up the extra hours with Vivian out awaiting heart surgery and together the team manages to track the young woman down after a supermarket parking lot kidnapping yeilds an unlikely clue.

Martin brings the team in on the hunt for a young woman that went missing after a priest attempted to exorcise a demon from her. He begins to feel guilty when he finds out he used to work with her, but doesn't remember her.

The team searches for Chris Manning, a family court judge with a soft side who went missing after meeting with a young boy caught between his mother and his abusive father. Suspicion initially turns anyone Manning may have riled up due to his court rulings, but after his clerk is shot in what appears to be an attempt on Manning's life, the team learns that the secret behind Manning's disappearance is tied up with something that happened over twenty years earlier.

The team searches for a man who goes missing after a late night dive and try to zero in on who could be responsible for his disappearance. Meanwhile, Danny and Elena take their relationship to another level.

When a man leaves his home in the morning with his daughter to take her to school and then to open his dry-cleaning store, but they both of they never make it there .

When a priest disappears Jack begins to think that the man is involved in some wrongdoing rather than the possible victim of a crime.

A school bus is abducted by kidnappers who demand more and more for ransom.

The team searches for a paraplegic who had been injured two years earlier in a car accident and is now missing. Their investigation shocks them when they discover the truth in what may have caused his disappearance.

Seven years ago, a thirteen-year-old girl named Amber Bryce went missing, and suspicion fell on her boyfriend, then-seventeen-year-old Curtis Horne. When Daisy Thorpe, who had become obsessed with getting justice for Amber's death, also ends up missing, the team is called in to investigate. While Martin and Danny work from the office, Sam and Jack work in the field, starting their investigation with the local cleric, Amber's father, and trying to find out why Curtis Horne has stayed in town all these years. While Vivian is home having troubles with Reggie, Martin makes a decision about his relationship with Sam.

Jack's methods for investigation of child molester could result in the case being kicked out of court. Then on top of that, the Office of Professional Responsibility decides to investigate the team, but their real target is Jack

The team discovers a long festering secret which sets off a deadly chain of events when they investigate the disappearance of the teenage son of a Secret Service man.

A bride disappears at her own wedding and suspicions of kidnapping. Meanwhile, the team explores the relationship between the newlyweds, who were lived together for a little while.

When Stephanie Healy doesn't show up for choir practice, the team heads in to investigate and soon learns Stephanie had recently had a fight with her boyfriend. While speaking with Eddie, the team is shocked to learn that Stephanie used to be Stephen Patrick Healy. Convinced that the truth to what is happening in Stephanie's present lies in her past, the team investigates who Stephen was. Vivian has trouble hiding her worsening problems from the team, and is upset that Martin has been talking to Sam about his suspicions.

John Michaels is a 71-year-old insurance investigator who went missing after last being seen getting into a car with two strange men. While investigating his disappearance, the team finds that he had recently tried to make amends with his ex-wife and has been trying desperately to get his older daughter on the straight and narrow. Things get strange in the case though, and all is not as it seems.

Martin and Danny are ambushed by Emil Dornvald, who ends up killing the prisoner they are transoprting. Martin is in serious condition, and a barely wounded Danny is at the end of his rope as he tries to find the man who put Martin in the hospital in critical condition. Jack has his hands full with keeping Danny in check and hunting down Emil Dornvald, the mercenary who had previously worked for General Gamba. Things get sticky when Victor Fitzgerald and Tom Banes of Homeland Security get involved, determined to make a deal with Nuru, whom Jack believes isn't the friendly that Homeland Security believes he is.

The team searches for a missing mother who they believe may be searching for her son, who is also missing.

The disappearance of an ultimate fighter leads the team to investigate his background, where they learn the man had a number of enemies.

Things with Jack and Maria's divorce are getting nastier as Maria's attorney forces Jack to relive not only his childhood traumas, but also throw his affair with Sam in his face and attack his dedication to his job.

The four-year-old adopted son of a celebrity couple is kidnapped, and the team must determine if the reason has to deal with the parents' status or the boy's own Sudanese origin.

They search for a retired U.S. Army officer who has disappeared right after a dinner that was given in his honor by former members of his Vietnam platoon

The team tries to determine whether or not the recent disappearance of an air traffic controller has connections to the Middle East. The team soon learns that his wife died in an automobile accident and he was having an affair with her sister.

The team searches for a missing teen who's abductor left behind an amateur tape with her appearing on it.

A TV weatherman arrives at work bleeding from his side and the team tries to beat the clock to find out what that has to do with disappearance.

The team considers if a father who cleans crime scenes for a living led to his disappearance with his daughter.

A truck driver goes missing after saving a boy's life, and the team determines if that has anything to do with his disappearance. Meanwhile, Jack's mental health is examined by a psychiatrist.

Wendy Kim goes missing during her shift at the family deli, and the team gets involved to find out what happened to the young Korean woman. It isn't long before they learn that Wendy had recently broken off an engagement to a young Korean man her parents were very supportive of, and that she had recently been doing a lot of on-line dating and had gotten herself involved with the wrong kind of men, including one who wouldn't take no for an answer.

The team Search for a missing motivational speaker only to find that there is an abundance of suspects,The find out that they man is no who he appears to be.

Five people with an odd connection go missing from a coffee shop, and the team determines what the connection had to do with their disappearance. Meanwhile, Samantha gets ready for the birth of her child.

The team searches for a fifteen-year-old girl who lived with her grandfather and was last seen at an Internet café. Sam gets an unexpected visit from her estranged sister.

Jack finds himself in the hotseat when a young white woman and a young black man, go missing on the same night and Jack is ordered to put more of the team's resources into finding the young woman.

When a spoiled heiress in her early twenties is kidnapped, the team has to work against the clock to save Chelsea, who is being featured on a website giving fans the option to choose whether she lives or dies. As they continue to investigate her disappearance, the team learns that Chelsea had finally been starting to grow up, but she may not have time to enjoy her new life.

After James Costa is kidnapped after enjoying a night out with his wife in Mexico, Danny and Jack go in at the request of James' mother-in-law, but find that between the Mexican authorities and the grieving wife, no one is too willing to help them. While Vivian, Sam, Martin and Elena work the case back in New York, Jack encounters resistance from the locals, and it is only with Danny's help speaking Spanish that they are able to get much of the information they need. The team soon becomes suspicious of Lucy Costa, convinced she knows more about her husband's disappearance than she is saying.

The team searches for a missing teenager who was paranoid about his own personal safety and left an ominous message behind.

Malone's team joins forces with Gil Grissom, a CSI from Las Vegas, and his team as they track a serial killer with ties to New York. The crossover starts on CSI: Crime Scene Investigation S08E06 Who and What (I).

The team searches for 18-year-old Brandon Parker only to learn that 15-year-old Matt Jameson had stolen his former teammate's identity in order to get a job to support his three younger siblings after his mother had taken off. They manage to connect Matt to an old friend from a former foster home, Casey Miller, and soon realise that Matt has gotten in over his head while trying to keep his younger sisters and brother together. Sam starts to get suspicious of Martin's behavior and confronts him on his drug addiction. She goes to Danny looking for help, but Danny is reluctant to get involved in Martin's problems.

Danny is skeptical when the pregnant girlfriend of his missing estranged brother, Rafael ""Rafi"" Alvarez, and mother of their 9-year-old son, tells him that Rafi has transformed himself into a responsible family man, who recently obtained a loan to open his own body shop. But Danny's investigation uncovers that Rafi has been seen with a convicted car thief, and the large sum of cash he'd been flaunting for his purchase of a body shop didn't come from the bank. Though Jack makes the point that Rafi may have legitimate explanations for the suspicious circumstances, Danny braces himself for the very real possibility that his brother may have put himself in harm's way.

When a female ex-cop-turned-bounty-hunter is shot then goes missing the team must investigatesher were about's

Megan Sullivan is H.I.V. positive, pregnant and missing. Initially the team suspects that her husband, who seemed to be less than thrilled about the baby, is involved, but soon learn that Megan had received a call from a prison, and their search tracks them to a former lover, who gave her H.I.V., her husband's former mistress, who had seen her taking part in a tense conversation not long before she vanished, and her own H.I.V. specialist, who had recently given her bad news. Martin thanks Danny for his help, and tells him that he is continuing to seek counseling for his addiction.

The team searches for a teenage figure skater who disappears after practice one day and discover that many people in her life had reason to worry. The team's investigation leads to the rink's operator, a convicted rapist who was the last to see the girl.

When a woman disappears after her boyfriend is killed by the police, the team suspects gang involvement. Later, Sam learns she's pregnant.

The team finds a secret to a bank manager's past after she vanishes, which may just hold a clue to her disappearance. Meanwhile, Jack is named head of the department once again.

After Breck Mulligan goes missing from the women's shelter he had been working at, the team is called in to investigate. Breck was originally assigned to work at the shelter as part of a his probation for drug related offences, but the plight of the women and children seeking help had gotten to him and he had continued to work for the shelter, even going so far as to sleep with rich older women to get donations to help the shelter. The team is surprised to learn how little faith Breck's family and friends had in him, discovering that his friends had staged in 'intervention' the night he went missing, trying to convince him to walk away from his new life.

When a college student disappears after making racial remarks in a class, the team wonders if those may be directly connected to his disappearance.

The team searches for a missing criminal defense attorney. While investigating the man's life, Jack begins to believe that his recent behavior is the result of paranoid schizophrenia.

When a young artist disappears, the team is concerned that one of her subjects may have been unhappy with her work.

When Luke Horton disappears after a class reunion, the team initiates a search for him, and learn that Luke was living a double life and was finally ready to come clean.

The team has a wealth of suspects from which to choose as they search for a missing paparazzo who felt responsible when one of his pictures outing a TV star led to the actor's ruin and eventual suicide, and vowed to redeem himself and his career by helping an environmental watchdog group expose a corporation's cancer-causing pollution.

The team looks for a missing journalist after her hardcore exposes are published on an on-line magazine. They begin to suspect a politician, the subject of one of her latest entries. Meanwhile, Brian remains in Sam and Finn's life.

When 17-year-old Ted Soros goes missing after a basketball game, the team begins an investigation, soon learning that Ted was an emancipated minor who was living on his own to attend a school with an exemplary basketball program. Learning he had recently contacted his mother with a request for legal advice from an uncle, the team begins to suspect that Ted may have done something that he could face criminal charges for, and realise that Ted's secret is connected to a university recruiting party. While the team works Ted's disappearance, Jack learns from Ann that she lost the baby, and waits for her at the clinic while she seeks medical attention.

The team tries to track down a reclusive columnist who hadn't left her apartment in months and was communicating with numerous prisoners.

The winner of a plastic surgery make-over T.V. show vanishes during a publicity event, which was all about her.

The team is called in to investigate the custody kidnapping over a teen who vanished after last seen with her mother. But the case takes a turn when they discover the teen was living a secret life. Meanwhile, there is a bump in the road of the relationship between Jack and Samantha.

The team investigates when a young paramedic with gang ties disappears. Jack and Ann bond over their recent losses.

Jack and the team investigate the disappearance of Alex Stark after his girlfriend reports him missing, and soon learn that Alex didn't own a cleaning business like he said he did but was actually involved in an illegal gambling operation. Jack goes undercover at a club that Alex would gamble at to find out what happened to him, and ends up being taken hostage by an associate of Alex's who becomes convinced that Jack is actually there to kill her. Unfortunately for Jack, his team believes that he has changed his cover story and has no idea that he's actually been kidnapped.

Jack and Samantha head to Los Angeles to look into the disappearance of a man who vanished after attending a funeral.

Maggie Cartwright appears to have simply walked away from every thing in her life, having left everything of hers behind. Later a ransom note appears on her mother's email list demanding a million dollars for her safe return.

A former soldier, now stuntman, goes missing and the team learns that he changed his will only short time before he went missing which makes them wonder who needed the money.

Eleven-year-old Gabe Freedman is separated from his father on the subway to Yankee Stadium.

The team investigate a disappearance of a flight attendant who may have been having a relationship with one of the pilot's.

This time, the team searches for a delusional appearing Sci-fi fanatic who disappeared from his appartment after ranting on about those ""out to get him"" (before peeling back the tinfoil covering his windows). Jack also has to deal with the consequences of his actions in the affair and how it affected the rest of the team.

The team adds a new member who already as a connection to one of the team as they search for a missing prostitute.