When three numbered trunks with bodies in them are found scattered around Los Angeles, Detectives Charlie Crews and Dani Reese find themselves on the trail of a serial killer.
Charlie Crews and Dani Reese investigate the death of a family man who is found beaten and bound to a chair at the bottom of an empty pool. Captain Tidwell is convinced it is gang violence and sends the detectives on assignment.
A cancer research scientist's body is discovered frozen solid. It seems that an animal rights group took revenge on the doctor by switching out his oxygen tank with pure liquid nitrogen. The detectives become increasingly skeptical about who the murderer could be. Meanwhile, Crews is determined to prove Jack Reese had something to do with his incarceration, and Ted asks Crews to act as a reference for him.
Us against Thema University’s prison experiment goes horribly wrong. One of the students acting as a corrections officer ends up dead. As Crews and Reese interview both prisoners and guards, the detectives discover the social experiment may have done little good. Meanwhile, Crews obsesses over a recording he gets from a wiretap he placed on Reese.
A college student is found crushed to death inside of a wrecking yard. Detectives Charlie Crews and Dani Reese visit the victim’s fiancé and discover the young man was involved in an online love triangle, with everyone hiding behind their fantasy identities. Meanwhile, Crews continues his investigation of Jack Reese by searching for the four cops found in an old photograph of a slain police officer.
When an earthquake hits Los Angeles, it turns the city into one big mess. Crews and Reese try and track down an escaped criminal and killer they put behind bars a year prior to the recent event.
A woman is found stabbed to death, sitting at a table with a dinner set for two. The investigation takes Crews and Reese to a support group for lottery winners. The detectives discover lottery winners suffer broken psyches after suddenly becoming rich. Meanwhile, Rachel refuses to tell Crews anything about her family's murder.
A murder happens in a mall on "Black Friday," the busiest shopping day of the year. Charlie Crews and Dani Reese search for, not only the killer, but also the body, which went missing shortly after the incident amongst the crowds of shoppers.
A drug dealer and an elementary school teacher are found dead. It looks like a drug deal gone bad, but the investigation takes a turn when Crews and Reese discover that the teacher was a "Badge Bunny," a term used for women who only date cops. The detectives realize the killer could be one of their own. Meanwhile, Crews and Jennifer address their relationship and Ted has trouble keeping students in his class.
A sheriff's deputy is found Murdered on an Indian reservation. Crews and Reese are in the middle of a turf war between the Tribal police and the county sheriff's department. The detectives learn that the opening of a new casino may have led to the murder, as the deceased deputy was not well liked. Crews attends a fundraiser thrown by Mickey Rayborn, one of the individuals believed to be involved in the conspiracy against him.
A food bank deliveryman is found buried, up to his neck, in a backyard. Also, flower petals were placed around the deliveryman's head, making him look like a large flower.
Crews and Reese investigate the deaths of three Russians that Crews connects to his investigation into Mickey Raybourne. He follows the trail to Roman, the mob informant, who is revealed to be involved in human trafficking.
After recovering from his shooting, Crews goes back to work. He claims he is unable to remember who shot him which Tidwell finds suspicious. A retired astronaut is shot and killed mid-flight.
The lead singer of a heavy metal cover band is killed. Crews and Reese question the other band members and find out that the former front man that played with the band, had a bone to pick with the dead singer.
A man is found beaten and shot to death, with money in his mouth, in a house with no roof. Crews and Reese's investigation uncovers an elaborate construction scam that left the victim's clients both roofless and broke.
When Reese is asked to be part of a joint organized crime task force for the FBI, Crews and Stark must investigate the murder of a financial advisor who had a fondness for women and pigeons. The investigation leads Crews and Stark into the world of contract killers.
Crews and Stark investigate the death of a soldier who was stabbed in the chest while on leave in Los Angeles. Their quest for the killer leads them into a world of extreme corporate and political power. Meanwhile, Crews makes a shocking discovery with the help of the late Mickey Rayborn's security specialist Amanda Puryer.
With Reese still on loan to the FBI, Crews is assigned a new partner, Detective Jane Seever. Seever, the exact opposite of Reese, is quite the over achiever. Crews and Seever get right to work on the murder of a court reporter that was clubbed to death with a three iron. The reporter turns up dead after becoming pen pals with a convict who was imprisoned for a jewelry heist.
When a Los Angeles Coroner is found murdered his co-workers become prime suspects. Crews and Seever are under pressure to quickly solve the case because if the killer is another coroner, countless murder cases could be compromised and guilty people set free. Meanwhile, Ted attempts to reconcile with his daughter.
Crews and Seever investigate the death of a California State Representative who is shot and killed in her home. The detectives discover the representative was the force behind a political initiative that would put a comprehensive ban on handguns and cost a gun manufacturing company millions in profit.
Crews must locate his partner Reese who has gone missing while on loan to the F.B.I. Her disappearance is directly tied to Crews and he will do whatever it takes to get her back. In the events that transpire, shocking details about the conspiracy against Crews will be revealed.