Mike is recruited by a Nigerian drug lord to teach gang members how to shoot. Paige gets Jakes and Tuturro to go undercover with a marijuana farmer.

Charlie learns a secret about Briggs and works with a Federale. Mike finds out that Juan is missing.

The team tries to find the bus line responsible for smuggling contraband into the country. Tuturro sells an antique gun to the son of a cartel leader.

Johnny pitches an alternative way to traffic drugs to the head of a drug cartel in Mexico. Mike must cover up a horrific crime while undercover.

Even as the agents bait their final hooks against the Solano Cartel, it dawns that Sid may still have a few tricks of his own.

As the arrests of Sid and the Solanos near, even the best laid plans begin to crumble.

Briggs tries to keep control of Ari Adamian while Charlie struggles with the decision to terminate her pregnancy.

Johnny goes undercover to stop a gang war; Jakes and Charlie set out to take over Germaine's business; and Mike begins to piece together Briggs' plan.

The feud between the Sarkissians and a local gang heats up; Briggs' motives are revealed; and Mike hunts for the sarin gas.

The agents struggle in the aftermath of the gang war while Briggs tracks down a loose end in order to bring Ari Adamian to justice.