In 1999, three women went missing in Yosemite National Park, launching the largest search and rescue operation in US history. The bodies of two of the women are found in a burned car, and the third is only found when the killer sends a taunting note to the FBI. Five months later, when a fourth woman is found beheaded near the park, the Bureau believes a serial killer may be on the loose.

In 2013, Jimmy Lee Dykes shoots and kills a rural Alabama school bus driver and takes a five-year-old boy hostage in a carefully constructed bunker. The FBI discovers that the bunker is lined with explosives and Dykes is heavily armed. After a six day standoff, Dykes sets a deadline for the following day to broadcast his grievances on TV news, or he will kill the boy and himself.

On Sept 17th, 2016 a bomb detonates on 23rd Street in the Chelsea neighborhood of Manhattan, injuring over 30 people and causing mayhem. In the following hours and days, multiple bombs are discovered across Manhattan and New Jersey, all homemade devices designed to kill or maim as many people as possible. The FBI works with local law enforcement to track down a suspect who comes to be known as “The Chelsea Bomber,” culminating in a nail-biting standoff.

In one of the most infamous serial killer cases in American history, the FBI works with local law enforcement in California to try and apprehend the so-called “Golden State Killer.” It’s a case that spans four decades, as the killer and rapist continually manages to elude law enforcement. Authorities resort to an unprecedented use of DNA data in an attempt to finally track down the man responsible for 13 murders and 51 sexual assaults.

On the 11th anniversary of 9/11, armed men storm the U.S. Special Mission in Benghazi, Libya. The attack kills US Ambassador Christopher Stevens and three other Americans. The FBI launches an international investigation to track down the perpetrators, but in the chaos of post-Gaddafi Libya, arresting a suspect is no easy feat.

Masked shooters attack an office Christmas party in San Bernardino, killing and wounding dozens of people. FBI investigators descend on the scene, looking for clues about the identity of the killers. But as they try to find out who the active shooters are, they’re faced with a more urgent question…where are they and do they plan to strike again?

A pipe bomb at a concert is the first of a string of explosions during the 1996 Atlanta Olympics; the FBI have a serial bomber on their hands.

An unknown sniper terrorizes the citizens of Washington, D.C. over three weeks in October, 2002. FBI investigators hunt for the murderer as the killings continue. With limited evidence and a series of false leads, the investigation stalls. Will a series of cryptic clues left by the shooter help the authorities end the killing spree?

After a family doctor well-known for performing abortions is gunned down in his suburban Buffalo home in 1998, all clues point to an anti-abortion extremist as the sniper.

The FBI Hostage Rescue Team works with brilliant FBI profiler Molly Amman to extract a five-year-old boy from a bunker built by a heavily armed captor named Jimmy Lee Dykes. The profiler must convince FBI director Robert Muller that negotiations with the erratic Dykes are doomed to fail.

Eric O'Neill, an FBI investigative specialist with no undercover training, manages to win the trust of suspected spy, Robert Hanssen — or so he thinks.

After a “family friend” murders a California mother and her 8-year-old son, the woman’s 16-year-old daughter is nowhere to be found. Authorities learn the killer has kidnapped Hannah Anderson and taken her to the remote wilderness of Idaho. The FBI’s Hostage Rescue Team receives a tip and tries to track down the pair before it’s too late.

Rumors swirled for years that two former NYPD detectives, Stephen Caracappa and Louis Eppolito were working for the Mafia, committing crimes that included murder, kidnapping and money laundering for their mob bosses. Both men retire from the police department and move to Las Vegas, but when a former Mafia underboss admits that Caracappa and Eppolitto carried out a number of murders on his orders, the FBI formulates a plan to bring the “Mob Cops” to justice.

The FBI doggedly wade through their prime suspect's emotional outbursts, half-truths and outright lies to find out what happened to Chyenne Kircher.

FBI agents uncover new evidence from the Birmingham Church Bombing that could finally bring justice to the young girls killed in this act of racial hatred.

Notorious Boston mobster Whitey Bulger, accused of 19 murders, has been on the run for 15 years. He went on the lam after being tipped off by a corrupt FBI agent. The Bureau brings in two hard-charging agents from outside the city to track down Bulger. Will their new approach lead to the capture of the FBI’s Most Wanted fugitive?

Two FBI agents go undercover to infiltrate a dangerous criminal motorcycle gang. The Outlaws – archrivals of the infamous Hells Angels – are running wild in Taunton, Massachusetts, bringing drugs and violence to the formerly peaceful town. The stakes are high as the agents plan a daring takedown. Will they make a big bust or will their cover get blown?

When an armed bank robber terrorizes the Boston area, the violent holdups leave bank employees and customers fearing for their lives. Without any solid leads, the FBI's Bank Robbery Task Force must use all its resources to catch the perpetrator in the act. But can law enforcement catch up to the Southside Bandit before the situation turns deadly?

As the FBI prepares for a final assault on the remote cabin where fugitive Randy Weaver is holed up, a gruesome discovery puts the entire mission on hold.

When a would-be terrorist attempts to set off a bomb in Times Square, the FBI embarks on a high-speed, high-stakes race against time to catch the bomber.

When the CIA's most valuable Russian assets start disappearing one by one, the Agency starts hunting for the mole who's been betraying them since 1985.

In the tense hours following the bombings, Sergeant John MacLellan heads out on his night shift. That same evening, an MIT police officer is murdered by two attackers. No one knows yet that the cop killers and the bombers are one and the same, and Sgt. MacLellan comes face to face with the perpetrators. The shootout that ensues leads to a citywide manhunt.

In 2015, a slew of Denver bank robberies turns deadly when bandits wearing masks from the horror film Scream stab and shove tellers to the ground, empty the vault and then lead police on a high-speed chase that sees two people shot in cold blood.

The FBI investigates the discovery of a dismembered body in Albania and learns a nearly identical crime in Brooklyn 16 years earlier could point them to the killer.

When two bombs cut a swathe of death and destruction through the crowd of runners and spectators at the finish line of the Boston Marathon, the FBI steps up to lead a massive manhunt for the perpetrators. As the nation watches transfixed, the Bureau and its law enforcement partners work against time to find the bombers before they can strike again. When the suspects finally emerge, they lead authorities on a deadly high-stakes chase through the streets of Boston.

After a fifty-one day standoff, the FBI decides to move in on the Branch Davidians and their leader, David Koresh. Three agents tell heart wrenching stories about what happened on that historic day and the deadly blaze that ensued.

Following the murder of a Deputy Sheriff by a Latino gang, the FBI leads a task force in Operation Knockout, the largest anti-gang operation in US history.

An ATF raid on the compound of an armed apocalyptic religious group in Waco, Texas turns deadly. After a terrifying shootout, four federal agents are dead and more than a dozen are wounded. The FBI steps in with its tactical and negotiation teams, but as both sides dig in, concerns grow about the intentions of the group's leader and the welfare of the children inside.

Mob boss Paul Castellano is gunned down in broad daylight. The FBI believe they know who's responsible; His successor John Gotti.

When University of Illinois student Yingying Zhang vanishes from campus, the FBI launches a frantic search to find her.

It's been more than two weeks since an 11-year-old boy went missing in Colorado Springs. As the investigation grinds on, the FBI recruits his father (an Army National Guard captain) to zero in on a suspect in the desperate hope that he'll be found.

After Bernie Madoff confesses to the FBI that he's responsible for a $64 billion Ponzi scheme he is quickly arrested, but the FBI's job is just beginning. They have the long task of recovering stolen assets to help those whose lives he had shattered.

As boss of the Gambino family, John Gotti has beaten every case the government has thrown at him. The "Teflon Don" seems untouchable but Gotti's hubris may play to the FBI's advantage.

When a woman is found dead in her own home, detectives come upon a curious clue; The killer stuck around to make himself a meal.

A small-time crook hoping for a break alerts the FBI to a cadre of corrupt cops within the Boston Police. But taking down three SWAT-trained members of a police force comes with unavoidable risks.

The FBI uncovers a state-sanctioned plot to steal technology that makes U.S. submarines nearly undetectable to enemy sonar - and deploy it in Chinese subs.

When an 11-year-old Colorado Springs boy is reported missing, local police initially classify him as a runaway.

The FBI receives a tip that Sal Magluta's bookkeeper is laundering millions of dollars for the Magluta-Falcon drug organization. When she flees Miami, the FBI uncovers a money laundering scheme that could take down the entire organization.

A man takes a rabbi and three congregants hostage at a synagogue in Colleyville, Texas.

A bomber seems to be targeting Austin's minority community. Three bombs kill two men and wound two women in 10 days.

For the first time ever, LisaMarie Freitas and Todd Heflin share their harrowing experience guarding the FBI Field Office during Hurricane Katrina.

Agents uncover the largest oxycodone trafficking operation in American history. But building a case is easier said than done, when the drugs are legal. The FBI zeroes in on twin brother pain clinic owners, suspecting they're running a pill mill.

The FBI has one shot to catch the McDonald's Monopoly scammers in the act. Agents deploy some very creative undercover techniques to gather evidence. Days away from the takedown, a fax sent to the wrong organization could derail the entire case.

With the aid of an undercover agent, the FBI surveils members of The Base as they sacrifice a goat to Odin in rural Georgia. Through a hidden camera and wiretap, FBI agents watch as members assemble a ghost gun and plot a mass shooting in Virginia.

The FBI gets a tip that the McDonald's Monopoly promo games are rigged, and a mysterious figure dubbed "Uncle Jerry" is behind this scam. There's a race against the clock, as McDonald's agrees to run one more game, hoping to catch him in the act.

When fashion designer Gianni Versace is murdered outside of his home, investigators discover a trail of bodies leading to a manhunt for a suspected serial killer. With the suspect on the run, the stakes couldn't be higher for the FBI.

In 2003, a disguised man robs the Xerox Federal Credit Union, killing one and injuring another. The case goes cold until 13 years later, when new DNA testing and a fresh tip bring a breakthrough, leading to a shocking resolution.

When a drug dealer reports extortion by a New Orleans police officer, the FBI launches a full-scale investigation into dirty cops. But the sting turns deadly when wiretaps pick up threats to an undercover agent and a cop ordering a hit.

With the Austin bomber changing his targets, the body count rises. One bomb explodes in a Fedex sorting facility but another is found at Fedex before it goes off.

The FBI faces down a group of anti-government ranchers and heavily-armed militias who've taken over a federal wildlife refuge in Oregon. A car chase through the mountains ensues, and when one rancher refuses to surrender, the showdown turns deadly.

The FBI's investigation into MS-13 in Boston is complicated by an informant's unsanctioned crimes.

Days before Christmas, a Pan Am plane crashes in the remote Scottish village of Lockerbie. 290 people are killed, including 190 Americans. The investigation leads the FBI across the world in a quest to find out what caused the unspeakable tragedy.

The Base, a violent white supremacist group, conducts training missions in rural Georgia in preparation for a series of attacks they hope will cause the collapse of American society. In this chilling multi-state, multi-subject case, the FBI must find a way to stop The Base before they set their deadly plans in motion.

When a woman from a small town in Oklahoma goes missing, state and FBI agents wonder if the suspect in that investigation fits the profile of the killer in the case of two young girls shot dead at the side of a country road - three years earlier.

The FBI teams up with Massachusetts State Police to infiltrate, disrupt, and dismantle the extremely violent MS-13 gang network in Greater Boston. They get a break in their case when a recently deported Salvadoran man agrees to become their informant.

When federal authorities seize a renegade rancher's family cattle in 2014, heavily armed anti-government militias come to his aid and a dangerous showdown ensues.