Police officer Vic Mackey and the Los Angeles Police Department attempt to rid the city of crime, using their own unconventional, and often illegal, methods.
Vic is left adrift by the Strike Team having been dissolved and him being stuck babysitting a menial surveillance sting that keeps him off of the street.
Vic agrees to quietly bring in a teenage drug user but then learns of his role in a deadly armed robbery.
When her official arrival at the Barn is greeted by the outbreak of a deadly gang war, Monica assigns Vic the task of ending it.
Vic pursues an escaped rapist as Assistant District Attorney Insardi sends Dutch and Claudette after a low-level drug dealer.
Monica is forced to defend her crime-fighting tactics, Vic's pursuit of a killer creates problems for Antwon, and Dutch and Claudette land a murder investigation.
A raid on a church that is being used as a drug drop gets Monica into hot water with the community and her own cops.
Aceveda uses a videotape to force Monica to sideline Vic before she can go toe-to-toe with a social worker whose negligence led to the hospitalisation of a foster child.
Shane is under orders to deliver Vic's body to Antwon, and Monica looks for a leak that has led to the murder of neighbourhood informants.
As Shane enlists Vic and his men in the search for the body of a teenage informant, and the disappearance of two cops looks like payback for Monica's tough new policies.
Vic decides to tell Monica the truth about Shane as Dutch and Claudette suspect an alleged serial killer of murder.
Vic pits Antwon's henchmen against each other in an effort to find the cop killers, and Dutch and Claudette suspect Detective Billings of failing to stop a deadly carjacking.
When Vic and Monica work to link Antwon to the cop killings, Aceveda sells them out in an effort to keep the truth about his sexual assault being made public.
Monica asks Vic to find a way to hold Antwon responsible for the murder of two Farmington cops.