Vic assists Connie as she tries to quit crack cold-turkey in a desperate attempt to keep her son, leaving Shane and Lem to investigate a strip-club mugging ring. Meanwhile, Dutch follows his instincts on the serial killer case and Danny is bitten by an HIV-infected perpetrator.

Vic and the Strike Team mediate a dispute between Rondell Robinson and the Nation of Islam while Dutch and Claudette investigate a brutal home invasion in the Korean community.

Aceveda turns to Claudette after a double homicide raises ire and fear within an ignored community. Vic is forced to help Assistant Chief Ben Gilroy avoid being implicated in a hit-and-run, while Shane and Lem follow the trail of a gunrunner with a penchant for cockfights.

In the aftermath of a riot, cops are being lured into ambush shootings by a rash of bogus 911 calls. Vic and Aceveda are forced to work together to stop the attacks and solve the problems in the Grove, while Gilroy tries to pit the two against each other in an attempt to save his own job.

As Vic gets closer to finding his family, the Strike Team focus their attention to Armadillo after he burns down Tio's HQ. Now Vic must prevent Claudette from finding out the truth about his connection to Tio and his men. Meanwhile, Dutch is followed around by the new civilian auditor to solve a meter-maid murder, and Danny and Julien try to clear up issues between feuding neighbors.

Still fuming from the death of Tio and his brawl with Armadillo, Vic takes a day off and leaves the Strike Team with Aceveda, only to end up helping an old partner bust the man who helped him lose his job. Meanwhile, Dutch and Claudette search to find the people behind the torture and mutilation of a woman who may still be alive, and Julien fails to back up Danny's side of the story from her shooting.

David works with Vic and the Strike Team to take down a dealer giving heroin to school kids, while Dutch and Claudette help a woman find her Alzheimer addled mother.

Detectives Wagenbach, Mackey and Wyms investigate a massacre at a women's shelter, and Captain Aceveda works with Lowe on the case of a stolen bicycle.

Vic and Emma try to help a woman who's in an abusive relationship. Vic and the Strike Team begin to make plans for the money train take down, even though the greenlight still has them on their toes. When David tells Dutch that he embarrassed the department with the Bob and Marcy case and that Claudette is now lead on all their cases, he's forced to take any action necessary to prove himself in a new homicide. Danny finally makes a stand against Yassirah.

When Lanie's report on the Barn is leaked to the press, everyone suddenly fears for their jobs, including David who's mentioned as the reason for most of the problems. Gilroy skips bail and winds up on Vic's doorstep looking for help, so while Vic and Shane deal with him Lemonhead is forced to show the newest member of the Strike Team the ropes. Meanwhile Claudette faces some of her own demons as she and Dutch try to uncover the culprit behind a possible robbery/homicide and Danny comes to a startling realization.

With Ronnie's face healed he comes up with a plan to take down the Money Train, and the Strike Team is all in. Unfortunately, a federal criminal comes back to Farmington, and the Team has to use every connection trick, and resource to bring him in to prove the Barn is still a force. Meanwhile, Dutch and Claudette investigate the rape of a young girl which leads to information that puts the case in a new light. Plus, an old friend from the past reappears to make Julien's life hell.

While the Strike Team puts the finishing touches on the money train take down, Vic goes it alone and works with Dutch and Claudette to find a missing kid. David gets an unwanted visit from the Chief and Julien receives an unpleasant surprise.

When a gang execution hits close to home for Claudette, Vic, Tavon, and Dutch work together to find the culprit before anyone else gets hurt. Shane, Lemonhead, and Ronnie are forced to choose between hitting the money train without Vic or letting it go. Meanwhile, Danny receives some life changing news and Julien's harassment reaches a whole new level.

The Strike team's attempt to play by the book comes to an abrupt end when they discover that two gangs, the Byz Latz and the One-Niners are attempting to alter the balance of power by acquring MP5s. Claudette and Dutch investigate the murders and feet decapitation of 4 Armenian men by the Armenian mob in their search for the stolen cash from the money train. Meanwhile, Danny who is doing temp work at a high school while waiting for an appeal, discovers she might me be able to get her old job back.

Vic challenges Shane and deals with threats to his family; a federal agent arrives in Farmington to investigate a recent wave of violence.

Vic works an angle to make himself valuable to the Armenian mob; Corrine finds herself in a surprising legal jam; Tina targets a producer of adult entertainment.