In the season two premiere, detectives Charlie Crews and Dani Reese are on the hunt for a serial killer when three numbered trunks containing suffocated bodies are found scattered across Los Angeles. With their new boss New York transfer Captain Kevin Tidwell pressuring them to get answers, Crews and Reese race to find a connection between the murders before the killer strikes again. Meanwhile, Ted and Crews attempt to track down the daughter, the lone survivor, of the family Crews was wrongly convicted of killing.

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 the murder was an act of gang violence and sends the detectives on assignment. After interviewing the victim’s daughters and two gang members, Crews and Reese’s only clues are an underground party circuit, a bottle of steroids, and a myth about a man only known as Monster. Meanwhile, Ted gets an unexpected visit from Dani’s father who is determined to find out what information Crews has on him and consequently has a request of Ted. Crews also enlists the help of his ex-wife Jennifer to reach out to Rachel , the lone survivor of the murdered family Crews was wrongly convicted of killing.

When a college student is found crushed to death in a wrecking yard, the probe leads Crews and Reese to a complex online love triangle; Crews continues his investigation into Jack Reese by hunting for the officers seen in his latest clue.

A woman is found in a pool of blood sitting at a table set with a romantic dinner for two; Rachel and Crews realize they share a common bond.

When a sheriff’s deputy is found murdered on an Indian reservation, Crews and Reese find themselves in the middle of a turf war between Tribal police and the county sheriff’s department. The detectives learn the victim was not well-liked on the reservation and the opening of a new profitable casino may have led to the deputy’s demise.

Crews attends a fundraiser thrown by Mickey Rayborn, one of the individuals Crews believes was involved in the conspiracy against him.

Crews's father, Charles Crews, Sr., shows up at his son's doorstep to try to mend fences. Crews and Reese investigate the death of three Russians; Reese falls into old habits.