Pete Antico

Gaines' boss finally loses patience with Gaines' ineffective pursuit of Jack, as Jack turns the tables. Meanwhile, Nina and Tony learn the plot to assassinate Senator Palmer goes deeper than they thought and Senator Palmer gets surprising news from Maureen Kingsley.

Walker finally goes head to head with "The Chairman," the criminal mastermind behind the assassination of a number of undercover federal agents, when Alex is kidnapped.

Nash goes undercover to stop a dangerous super-thief from stealing high-techcomputer chips for an arms dealer; Caitlin is promoted and will be conducting a fiscal audit of the SIU; and Evan returns to the unit.

Events are set in motion.