Bob Lee leads Solotov in a deadly game of cat and mouse to draw him into the open, but soon realizes the Chechen has had the upper hand all along. Flashbacks reveal the origins of this deadly man called Solotov, while Isaac is courted by his creator in the present - a man whose identity Nadine discovers in her investigation of "Atlas.".

Bob Lee and Isaac work together to escape a Mexican prison before Solotov finds them; Nadine digs into Atlas; Julie has problems with the law.

Bob Lee tracks Solotov's money and goes up against a Mexican cartel; Nadine helps a journalist investigate a cover-up; Julie makes her frustration heard.

Bob Lee tries to piece together Solotov's motive for targeting his unit; Nadine finds a witness to the event that set everything off; Solotov hides in plain sight.

Bob Lee and Isaac learn the world's greatest assassin is in the U.S.; Nadine comes to Texas with suspicions of a conspiracy.

Bob Lee finds Isaac Johnson in Texas after an attempt on his life; Nadine learns how much influence Patricia Gregson has; Julie fights to stay strong for her family.

Bob Lee looks into the terrorist attack that may have targeted his Marine unit; Memphis helps on the ground in Germany.

Bob Lee Swagger joins his former Marine unit for an awards ceremony in Frankfurt, Germany. There, he and his wife Julie narrowly escape a deadly terrorist attack. FBI Agent Nadine Memphis accepts a new job with powerful Washington insider Patricia Gregson.