Vic and the Strike Team go to Tijuana in hopes of finding those responsible for the poisoned cocaine. Dutch and Claudette search for the man who has burned alive the captains of two gangs.
Claudette concentrates on Armadillo's connection to two homicides and a rape as Vic tries to steer her in a direction that won't connect him with Tio, Armadillo's newest target.
Vic and Joe work together to try and take down an enemy from the past. Dutch and Claudette race against time to find a woman who has been battered and mutilated, hoping she may be alive, and nab the person responsible for the crime.
Vic and Shane go undercover as crooked cops. Claudette and Dutch discover that a gun handed in as part of a toys-for-guns exchange is connected to one of Claudette's previous cases.
David works with Vic and the strike team to bring down a schoolyard heroin dealer. Claufette and Dutch help a woman find her mother, who is a victim of Alzheimer's.
Dutch, Vic, and Claudette team up to find those responsible for a women's shelter massacre, while Julien and David end up working together to find a boy's stolen bike.
Dutch is forced to prove himself following the poor handling of a case, with Claudette as lead detective on their pending cases. Vic and Emma attempt to aid a woman stuck in an abusive relationship.
Vic and the Strike Team continue in their efforts to find Armadillo. Claudette comes close to learning some of Vic's dark secrets. Meanwhile, Dutch recruits Danny to help unravel an assault case.
Flashback to the Barn's first day, where Vic and his Strike Team take on the streets, David learns the scope of his authority, and Claudette and Dutch team up with one another.
The press gets ahold of Lanie's report on the Barn, causing everyone to fear for their jobs. Gilroy needs Vic and Shane to smuggle him out of the country after skipping bail, leaving Lemonhead to school the newest member of the Strike Team. Claudette and Dutch track down the person behind a possible robbery/homicide, during which time Claudette has to deal with some of her personal demons.
Vic and David are intent on being the ones to catch one of the nation's most wanted criminals, who has just returned to town. Claudette and Dutch confront a storeowner accused of rape by his underage employee.
The Strike Team finishes up with the takedown of the money train, while Vic works with Claudette and Dutch on the case of a missing child. Julien receives a less-than-welcome shock, while David finds the Chief dropping in on him.
Vic, Dutch, and Tavon work together to find the culprit in a gang execution and prevent more from happening. Ronnie, Lem, and Shane must make a choice as to whether or not they should hit the money train wihtout Vic. Meanwhile, Julien's harassment escalates, while Danny learns some life-altering information.