The Strike Team, hot off the heist of the Money Train, tries to keep Internal Affairs off their trail, but Claudette and Dutch press on as they investigate the murder of two Armenians who may have been involved.
As the Strike Team continues to keep the peace between two warring gangs, Vic tries to get back in the team's good graces, but it will take funds from the Money Train heist to help ensure the success of the gun running ring.
Claudette oversees the Strike Team and Decoy Squad, and the first order of business is a crackdown on prostitutes. Vic's involvement soon becomes more than he bargains for when a hooker wants him to help her nail her pimp, no matter how extreme the method, and he finds himself caught within a web of blackmail.
The Barn zones in on a high-profile carjacking involving a political figure, with both the Decoy Squad and the Strike Team betting on who will be able to solve the case, the loser forced to streak through the Barn.
After Shane conspicuously fails to come to Tavon's hospital bedside after his car accident, Vic goes to Shane's apartment where he confronts Shane and Mara and, after much lying from the couple, coerces the two into talking about the fisticuffs between Shane and Tavon.
The Barn rallies behind Tommy when his ex-wife and son are found murdered and he is brought in for questioning. The incident leads Vic to do whatever he has to to prove Tommy's innocence with an intensity that divides the opinions of Julien and Danny.
With the Money Train heist still under investigtion, Vic and the Strike Team go to extreme lengths to keep themselves clean of any ties to the crime. When Aceveda, however, heads up an investigation which ties back to an old, unresolved case of Vic's, the Strike Team's attempt at a defensive strategy is jeopardized.
Trish's secret phone call to the Barn for help has a frantic Strike Team rushing to rescue her and Walon on Claudette's orders. Claudette subsequently takes some heat from Walon over her perceived failure to keep him and Trish, who is still missing, from being I.
The Decoy Squad and Strike Team are questionably called into action by Aceveda when two racially charged murders threaten to create local chaos. With Claudette still in hot water, Vic manages to help get the Decoy Squad sent to another department and corals the Strike Team in order to nab the much sought-after murderers.
Aceveda becomes a man on a mission as he hunts down his assailants, Ricky and Juan, but finds his life in serious peril while present at a liquor store holdup.
The Strike Team stumbles into a prescription drug ring after questioning a trigger-happy gangbanger. When Danny is sent in undercover to pose as a drug runner, an elaborate crime setup is uncovered which also involves money-laundering out of a high-end custom automobile dealership, and Vic bargains with the dealer owner to keep a surveillance on any prominent individuals who might be involved.
Vic and the Strike Team get caught up in a deadly test of wits when the delivery of a warrant to a Korean criminal turns into a hostage showdown in a Korean neighborhood.
Aceveda learns of a mole in the Treasury Department leaking information about the Money Train heist, and the Strike Team must find the mole and plug the information leak to protect themselves.
The Strike Team preemptively tails Armenian gunman Margos by scoping him out in Little Armenia, and learns that the Armenians have been tipped off about them.
The Strike Team learns from Aceveda that Margos and the Armenians now have their pictures, courtesy of the mole, leaving the team with no option but to go after Margos first.