Mike Warren, newly commissioned FBI agent, gets his first assignment living with 3 other agents from the FBI, DEA and US Customs.
Mike discovers that life undercover brings with it some moral question, as he and Briggs use one gang to bust another.
Charlie finds that her informant is less than reliable during a drug deal and Briggs assists Lauren with her Russian Mafia case.
Tuturro and Jakes are convinced by Paige to go undercover with a marijuana farmer and a Nigerian drug lord recruits Mike to improve his gang's shooting skills.
As Mike manages to further infiltrate Bello's organization, Charlie and Briggs resurrect previous identities.
While Briggs helps to cover up some of Charlie's bad decisions, Mike persuades Bello to steal from a drug cartel.
Briggs decides to come clean and Charlie tells her house mates about her bust. Meanwhile, Mike believes he is coming to the end of his investigation.
When the Caza Cartel give Bello a deadly ultimatum, things get sticky for Briggs and Mike is forced to go further than he's comfortable with.
The residents of Graceland need to stop a war caused by Bello's strike against the Caza cartel. Meanwhile, Briggs' past comes back to haunt him and Charlie meets an unusual ally on her search for Odin.
Things are not looking good for Paul Briggs: Charlie teams up with a Federale to investigate him and he's the number one suspect in Juan's disappearance.
Briggs is forced to into making a major decision when Mike looks into Juan's disappearance.
Despite being wanted by the FBI, Briggs continues his pursuit of Jangles.