The Major Crimes squad investigates the mysterious disappearance of a teenage girl, who vanished while volunteering at a homeless shelter, while Buzz cracks open the decades old cold case file on the murder of his father and uncle. Andy Flynn considers selling his house.

An undercover agent's death leads to the unit's investigation into drug overdoses involving a porn website that specializes in girls who just turned 18. Meanwhile, Rusty finds out that his biological mom is pregnant.

The Feds and Major Crimes search for a possible terrorist when they discover that an ISIS-styled beheading of an American military veteran is filmed in Los Angeles. Meanwhile, Sharon has an idea to help Buzz with a bad evidence video.

When Flynn looks into purchasing a new home and seeks input from Provenza and Buzz, an unexpected turn of events leads to a new investigation for Major Crimes. Meanwhile, Buzz continues to look into the circumstances surrounding his father's murder.

Det. Julio Sanchez's application to become a foster parent is jeopardized by his reactions to a particularly gruesome murder after the Major Crimes Division finds a chopped up body burned to bits in the barbecue pit of an L.A. Park.

When a pair of British tourists get attacked on their second honeymoon during a Venice Beach robbery, L.A.'s twenty billion dollar tourist industry is threatened by an English journalist riding their tragedy to a career high. Meanwhile, Rusty's biological mother tries to make peace with him over her pregnancy.

After a shootout in a tow yard leaves three people dead, Major Crimes must scramble to find a disturbed man with a bag full of guns and a long list of grievances before he kills again. Meanwhile, Rusty pushes against LAPD policy in an attempt to find more evidence related to the murder of Buzz's father and uncle.

Lts. Andy Flynn and Mike Tao delve into the mysterious overdose of a young Hollywood star and the trail of emotional destruction he left in his wake, while Rusty finally comes to a conclusion about how to handle the pregnancy of his biological mother.

When a jogger takes a nasty fall down the steps of L.A.'s storied Greek Theatre, Major Crimes finds itself investigating a divorce attorney with a lot of angry clients, and Lt. Tao goes undercover in the world of college age hookers. Meanwhile, Buzz connects his partials to a complete print, and learns the identity of one suspect.

While investigating a murder that has personal implications for Sanchez, the squad uncovers a much larger criminal operation. Meanwhile, Buzz comes face to face with someone that may have been present at his father's murder.

In attempting to clear up loose ends from their investigation of a gang of White Supremacists, Major Crimes detectives audit the trial of serial killer Dwight Darnell, and end up facing their most deadly case ever while Rusty's psychologist, Dr. Joe, faces an unexpected confrontation that leaves his life in jeopardy.

The Major Crimes unit continues to investigate the conspiracy behind Dwight Darnell's murders and his links to the Zyklon-Brotherhood. Sharon Raydor, disturbed by her own reactions to the case, seeks penance in the Ritual of Confession.

Major Crimes hurtles forward towards the mysterious and elusive mastermind in the Dwight Darnell murders while Buzz and Rusty's investigation into the murder of Buzz's father comes to an unexpected end.

When Captain Sharon Raydor and the Major Crimes Division investigate the murder of a young woman found in the L.A. River, their case is impeded by a secretive P.I. working for a tech industry millionaire and by Deputy Chief Winnie Davis.

When Major Crimes discovers a young one-man-geek-squad in the middle of his Atwater living room with his throat cut, suspicions swirl around his roommate and some unwitting customers, all of whom he was blackmailing.

A murder case goes sideways at trial when defense attorney Linda Rothman is able to destroy Det. Amy Sykes's credibility on the stand. Helping Rothman as a defense investigator is Amy's old nemesis, Mark Hickman.

Major Crimes finds a very heavy body forty feet up a tree surrounded by loose pot when Dr. Morales shows up to the crime scene with his father, a retired detective from Uruguay. Meanwhile, Julio Sanchez works to obtain legal guardian of Mark Jarvis while Andy Flynn prepares a special surprise for Sharon.

Sharon's son, Ricky, comes home for a surprise visit while Major Crimes investigates what looks like the "follow home" murder of a retired LAPD fraud detective, who may have been murdered for an arrest she made decades ago.

As the war between bikes and cars escalates in the streets of L.A., Acting Assistant Chief Fritz Howard deploys Major Crimes to solve a tragic hit-and-run. Lt. Provenza, frustrated by the never-ending contest to succeed Russell Taylor, contemplates retirement.

A murder investigation turns explosive while Captain Raydor duels with Chief Davis for control of her case as she and her squad try to determine if they are dealing with a terrorist. Meanwhile, Rusty gets some alarming news from Gus.

After discovering the identity of the bomber her division has been searching for, Sharon Raydor and the Major Crimes squad struggle to determine his next target as Major Crimes heads for an explosive season finale.