In the thrilling season finale, Callie's hospital is on lockdown when a pair of ex-con brothers take hostages. Longworth and Callie work together to ensure the safety of the hostages, but things take a turn for the worst leaving Longworth to defuse the situation before it explodes.

Longworth investigates the death of a famed treasure-hunter who was after a Spanish ship believed to contain billions of dollars in booty. Longworth must figure out if the victim was close to finding the treasure and if that's what got him killed. Callie's passion for treasure hunting lore sets her and Longworth on an adventure that just might change their lives.

Longworth teams up with his old partner, Detective Samantha Harper to track a serial killer from Chicago and Callie can't help but notice the obvious chemistry between them. Manus asks Callie to work as a forensic nurse for the FDLE.

Longworth's case involves a tribal leader found dead at a Native-American owned casino. The first hurdle is getting the tribal police to let the FDLE run point. Callie has convinced herself that she wants only friendship from Longworth but finds herself jealous seeing Josie Tigertail, a tribal police officer, interact with Longworth.

On the day of Callie's board exam, Jim must solve the murder of a businesswoman who had founded a new surf clothing line and was about to offer the endorsement opportunity of a lifetime to a young, local surfing champion. Jim gets more frustrated over Callie's lack of communication, while a sympathetic Jennifer tries to comfort him. As he faces an uncertain future where Callie's career in Atlanta will pull her further away from her life with him in Palm Glade, Jim realizes he must make a decision on where their relationship is headed.

The murder of a woman who contacted the Innocence Project to exonerate a death row inmate now forces Jim to team up with the detective who investigated the original case: Jim's former partner when the Florida State Attorney General's office calls her to testify against the IRS agent who handled her audit and tried to extort her for sex a few years back. Reluctant to take time off to help the State Attorney, Callie is surprised when Miranda is not only supportive of her request, but also learns that Miranda has been the victim of sexual harassment herself, and the two women bond through their shared experience.

When Jim finds the ex-Navy Seal owner of his favorite food truck dead in the truck's kitchen, he ends up embroiled in a heated political battle between the new wave of gourmet food trucks and the established boardwalk restaurants. Jennifer takes an active and prying interest in Jim's cases, while Callie's attempt to confront Miranda about her hostility backfires.

While Jim helps Callie settle into her new apartment in Atlanta, Carlos performs a guest autopsy for Daniel's forensics class at Tampa Tech. He discovers that the cadaver he is dissecting is actually a murder victim who turns out to be a student that was killed while participating in an on-campus pharmaceutical study. Also, the Palm Glade substation gets a new addition when FDLE Bureau Chief Jennifer Starke comes down to visit Manus, while Callie gets off to a rocky start with her new boss Dr. Miranda Buckley.

The daughter of a notorious Cuban mobster turns up dead in a Little Havana alley, and Longworth and the rest of the Florida Department of Law Enforcement must solve her murder to prevent an all-out war between two rival mob families. Meanwhile, Callie prepares for her husband’s release from prison.

A stolen car and a body have Jim investigating some NASCAR drivers. After Ray is attacked, Callie must consider the option of witness protection.

A man recently released from prison is found dead along the fairway. The victim was the caddy and life-long friend of professional golfer Scott Winters. Things don't add up for Longworth when he discovers the victim may have served time for a crime he didn't commit. The case motivates Longworth to commit to breaking 80 on the greens. Heather tempts Longworth with her cooking while Callie frets over their relationship. Daniel seeks a promotion from his intern status

When body parts of a Coast Guard Reservist are found in the belly of a poached wild boar, Longworth hunts the killer into the depths of the Glades. Meanwhile, Callie and Longworth decide to push the restart button on their romantic relationship.

Jeff's mentor, the high school soccer coach, is found shot dead on campus.

When the co-owner of a luxury medical spa turns up dead, Jim and Jennifer investigate the spa's members and discover the high costs the wealthy pay in order to stay looking young and beautiful. Callie gets anxious while both studying for her boards and preparing for her testimony against Elkins. Her house in Palm Glades is falling apart, but her life in Atlanta is picking up.

A beautiful synchronized swimmer in an elaborate mermaid costume washes ashore dead, and the clues lead Jim to a bittersweet love triangle and a hip hop mogul trying to turn a mermaid show into multimillion-dollar phenomenon. On the home front, Callie hits a wall in her job search, and Jim realizes the best opportunity for her is the one in Atlanta she passed up to be with him.

In a lush, sun-drenched state preserve in Palm Glade, Florida, a young couple in a parked car wakes from a night of drunken carousing to find the body of a headless woman submerged in the area known as Fisheating Creek.

Jim gets called back to the golf course to catch the murderer of a golf hustler, but he's handicapped by a mad scramble to tie up loose ends for Callie and his future.

Jim investigates the death of a billionaire oil tycoon and art collector on the eve of Art Basel, Miami's international art show, while Callie's past may be putting her future at risk.

Jim gets roped into a long-standing family feud between Florida ranchers when a ranch hand turns up dead between the two family's properties. Someone from Callie's past visits her pleading for help at the worst possible time.

The murder of the spokesmodel for a prominent rum brand sends Jim into the sexy, cutthroat world of liquor promotion to find the killer.

While Jim searches for the killer who smoked the owner of a vast BBQ empire, Daniel enters a BBQ competition with his biggest rival: his brother Drew.

When a man is killed by a Civil War reenactor's sword, Jim must enter the fray to find which imaginary soldier committed a very real murder. Meanwhile Callie makes a tragic discovery at work, while Jim receives foreboding news for Callie and Jeff.

The FDLE enters the battle between good and evil when a Pentecostal preacher is found dead in a snake pit. Longworth's investigation into the House of God eventually leads him to the Big House and a fatal case of mistaken identity. Meanwhile, Sam's departure has Callie questioning her own relationship with Longworth.

When a male stripper (dressed like a police officer) is murdered by person or persons unknown, the department initially thinks a cop killer is on the loose.

Jim Longworth takes Callie's son Jeff to a heavily-wooded area to collect bugs for a school science project. In the effort, they stumble upon an abandoned airplane with a dead body inside. The victim turns out to be a retired Special Ops guy who taught flight school lessons on the side to make extra money.

While Jim unravels a three-way polyamorous relationship tied to a murder, his father Michael drops a piece of news that blindsides Jim.

When the VP of a local bank is found dead in the vault, Jim discovers her tattoo and bruises reveal a double life as the star jammer of a rough and tumble roller derby squad.

The murder of the first female professional Jai Alai player leads Jim to investigate the multi-million dollar gambling industry in Florida built around the 600-year old sport, and Jim's mother Joan arrives to join the dysfunctional reunion.

Longworth must delve into a 150-year-old ghost story to solve a murder when the dead body of an heiress is found in a haunted plantation house.

What appears to be a ritualistic murder leads Jim to investigate the secret world of Florida's gypsies just as he gets an unexpected visitor at home: his father, Michael.