Welcome to Graceland - a prime piece of real estate that was seized from drug lords and now serves as an undercover residence for agents.

When ongoing investigations clash, Briggs and Mike seize the opportunity to tilt rival gangs against each other while Mike learns that undercover life comes with many moral complications.

Briggs calls on the house to help Lauren with her case against the Russian Mafia and Charlie gets into some hot water when her C.I. proves unreliable during a dangerous drug deal.

Despite Briggs' hesitations, Mike gets recruited by a Nigerian drug lord to teach gang members how to shoot well, while Paige recruits Jakes and Tuturro to go undercover with a flirtatious and dangerous female pot farmer.

While Mike gets deeper into Bello's organization by trying to convince him to hire him as his bodyguard, Briggs and Charlie resume their former identities as a sexually-charged couple to get intel on a mysterious drug supplier called Odin from a drug dealer names Quinn.

Mike convinces Bello to steal from the most powerful drug cartel in Southern California and calls on Johnny's unique underwater skills to help.

The newly formed Briggs-Bello alliance is tested when members of the Caza Cartel head north with a deadly ultimatum. During the aftermath, Mike is forced to push his own limits for the good of the case.

Bello's last strike to the Caza Cartel sets a war in motion that Graceland now needs to stop. While on her hunt for Odin, Charlie meets an unusual ally and Briggs comes face to face with the past.

Tempers flare and relationships are pushed to the brink when Charlie discovers a secret about Briggs and begins working with a Federale to find the truth. Mike discovers that Juan is missing and that the FBI has a suspect: Paul Briggs.

In this season finale, the infamous Caza enforcer Jangles takes a member of Graceland hostage and the house must come together in order to save one of their own from a sadistic killer.