Annie and McQuaid's relationship deepens as they search for Belenko's next target; Calder lands in hot water while searching for the truth. Meanwhile, Joan concludes keeping Belenko alive is in the best interest of the CIA.
Annie searches for a rogue chemist in Germany after Auggie uncovers a startling link between the recent attacks on American soil. Elsewhere, Joan's time in the Balkans rouses suspicions after an unplanned polygraph.
Annie's stake out ends abruptly when the CIA discovers confidential intelligence may have been leaked. Meanwhile, Joan and Arthur compete for government funding, and Calder's personal and professional lives collide.
The Season 5 opener finds Annie and Auggie thinking about the future just as a connection from the past resurfaces and leads Annie on a race against time to prevent a terrorist attack on U.S. soil. Elsewhere, tension mounts between Calder and Joan as they wait to see who will become the new boss; and Arthur thinks about a career in the private sector.