On August 8, 1963, Britain awakens to the news of the biggest robbery in the nation's history. The Royal Mail train from Glasgow to London has been hijacked, and a gang has made off with millions in cash. In a role that won her a BAFTA TV Award for Best Actress, Sheridan Smith (Black Work) stars as Mrs. Charmian Biggs, naive wife of one of the robbers, Ronnie Biggs (Daniel Mays, Line of Duty).