The squad investigates the disappearance of a teenage girl who vanished while volunteering at a homeless shelter; Buzz opens the cold case file on the murder of his father and uncle; Andy Flynn considers selling his house.

The murder of a Sex Crimes detective leads Major Crimes into the world of pornography; Rusty's biological mother returns with some surprising news.

After an ISIS inspired attack against a member of the US Armed Services, the FBI asks for Captain Raydor’s help in finding a terrorist, joining the Bureau in a race against the clock before the terrorist can strike again.

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.

The city's tourist industry is threatened by an English journalist when a pair of British tourists are attacked on their second honeymoon in Venice Beach; Rusty's biological mother tries to make peace with him.

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.

Andy Flynn and Mike Tao investigate the mysterious overdose of a young Hollywood star; Rusty decides how to handle the pregnancy of his biological mother.

Major Crimes investigates a divorce attorney with a lot of angry clients; Lt. Tao goes under cover in the world of college-age hookers; Buzz learns the identity of a suspect.

The squad uncovers a large criminal operation while investigating a murder; Buzz encounters someone who may have been present at his father's murder.

In attempting to clear up lose 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.

When Captain Sharon Raydor and the Major Crimes Division investigate the murder of a young woman found in the LA River, their case is not only impeded by a secretive PI working for a tech industry millionaire, but also by Deputy Chief Winnie Davis, who regards Sharon as competition for the promotion to Assistant Chief of the LAPD.

When Major Crimes discovers a young one-man-geek-squad with his throat cut in his living room, suspicions swirl around his roommate and some unwitting customers.

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

A heavy body is found forty feet up a tree surrounded by marijuana when Dr. Morales shows up with his father, a retired detective from Uruguay; Julio Sanchez works to get legal guardianship of Mark Jarvis; Andy Flynn prepares a surprise for Sharon.

Sharon's son Ricky comes home for a surprise visit; the department investigates the 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, 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 Traylor, contemplates retirement.

A murder investigation turns explosive while Captain Sharon Raydor duels with Chief Winnie 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.