Season 2 kicks off with Martin Odum hiding out in present-day London and searching for clues about his identity with help from a CIA agent (Kelly Overton). Elsewhere, an investigation is launched into a Russian gangster.

Martin makes contact with a woman who may be linked to his past. Meanwhile, Dmitry embarks on a mission in 2001 Prague to find a wanted war criminal, yet concerns rise that Dmitry may be going too far with his infiltration techniques.

Martin prepares Kate for a perilous mission in present-day Paris. Meanwhile, Gabi confronts intelligence agents in Prague; a vulnerability in Dmitry is discovered; and Alex is recruited for a distinguished position.

Martin makes a deal with the Russians to rescue Kate. Gabi struggles to make a decision about her husband. In 2004, Dmitry asks one last favor of Terrance. In 1972, the last pieces of the puzzle to understanding Martin Odum's identity are revealed.