In 1950s Soviet Russia, secret police agent Leo Demidov (Tom Hardy) loses everything when he refuses to denounce his wife, Raisa (Noomi Rapace) as a traitor. Finding themselves exiled to a grim provincial outpost, Leo and Raisa join forces with Gen. Mikhail Nesterov (Gary Oldman) to capture a serial killer who preys on young boys. They soon find that their investigation threatens a system-wide cover-up enforced by Vasili (Joel Kinnaman), Leo's psychopathic rival.