MI5 officer Johnny Worricker (Bill Nighy) and Margot Tyrell (Helena Bonham Carter) are on the run together across Europe. But Worricker knows his only chance of resolving his problems is to return home and confront his nemesis--the prime minister, Alec Beasley (Ralph Fiennes). Worricker is haunted by the suspicion that he's not the only person out to undermine the prime minister.