Bob Lee and Isaac learn the world's greatest assassin is in the U.S. Flashbacks to a mission in Afghanistan reveal his identity: Solotov. Nadine comes to Texas with suspicions of a conspiracy.

Bob Lee tracks Solotov's money, pitting himself against a Mexican cartel. Nadine helps a journalist investigate a cover-up involving Bob Lee's unit. Julie makes her frustration heard with a gun.

Bob Lee and Isaac must team up to escape a Mexican prison before Solotov finds them. As Nadine digs deeper into Atlas, the cover-up points back to Bob Lee's unit. Julie has problems with the law.

Bob Lee tries to draw out Solotov, but realizes he holds the upper hand; flashbacks reveal the origin of Solotov; Isaac is courted by his creator. Season Finale.