Martin, Crystal and Troy Buchannan go undercover when a chemistry teacher and his family are kidnapped. The case takes on urgency when it's feared the kidnappers will use the teacher to manufacture a deadly gas.

Martin gets the Colonel and Ana Paulanos captured after purchasing VX gas from them. One of the Colonel's followers discharges VX gas on a crowded bus and guarantees to strike again if the Colonel and Ana aren't freed.

Amid concerns raised by the FBI psychiatrist, Martin is required to take time off. Instead he continues his off-book operation to uncover his own identity. Under cover of a new legend he tracks down McComb's contacts in Texas.

Dobson's mysterious employers, The Verax Corporation, send a team of professional hitmen to retrieve Dobson, forcing Martin to take his prisoner on the run in a frantic escape back to Los Angeles.

Martin escapes from the Saudi's interrogation only to learn that Sonya and Aiden have been kidnapped. In the process of tracking them down, he learns more about the connection between Verax, Arcadia and his own past.

Martin discovers that Verax may be plotting an assassination, led by a mysterious figure named John Cameron. When Martin gets kidnapped while investigating, he's shocked at what he discovers regarding his own identity.