The agents continue to work on closing their ongoing cases, while repairing broken relationships. Meanwhile, Briggs takes a high risk operation within the Armenian Mafia

Briggs tries to keep control of Ari Adamian. Meanwhile, Charlie must make a difficult decision regarding her pregnancy.

While Mike's visions and addiction to pain medications start affecting his ability to function in the field, Briggs coaxes a former FBI agent out of retirement to help take down Ari.

When Ari has no recollection of his actions from the night before, Briggs, with the help of the other Graceland agents, helps him piece together the disturbing details.

In the wake of a death of an agent, Briggs helps Johnny make a deal with Carlito in order to save Lucia. Meanwhile, Mike's visions lead him to a small-time crook with a dangerous secret.

As Mike devises a plan to learn more about the contents of Gusti's trunk, Briggs helps Paige go undercover with the Armenian Mafia's shipping company.

Plans take a turn for the worse when Charlie attempts to pull Amber from Florida, and in an effort to aid Briggs, Paige sets up a bust to pull the plug on the Sarkissian organization. However, things are not always as they seem.

While Mike questions Briggs' true motivations in the Sarkissian Case, Charlie devises a new angle to catch Germaine.

Johnny must infiltrate Soto Street to prevent a gang war, Jakes and Charlie aim to take over Germaine's business, and Mike begins piecing together Briggs' master plan.

Johnny needs to infiltrate Soto Street to prevent a gang war; Jakes and Charlie try to take over Germaine's business; Mike begins piecing together Briggs' plan.

As the feud between the Sarkissians and a local gang escalates to uncharted heights, Briggs' motives are finally revealed, and Mike's hunt for the Sarin gas holds hundreds of lives in the balance.

While the agents of Graceland struggle in the aftermath of the gang war, Briggs must track down the final loose end he needs to bring Ari Adamian to justice.