Laura is desperate to find out what happened to her sister Diana. Both were Special Operation Executive spies during World War Two. One night in 1944, Diana was flown into occupied France but never returned. Could she still be alive? James Hadley Webb, the man who sent Diana on her final mission, is now a spy in Berlin. Despite attempts to stop her, Laura travels to Germany to confront him and soon becomes caught in the crossfire of a bloody turf war fought between the East and the West for control of the city.