"What starts out seemingly as another Arsene Lupin imitation develops into a far more complex, almost Sartre-like melodrama of irony. A handsomely-mounted film, set in pre-World War I Paris" (William K. Everson). The suspense involves a brilliant safecracker (Guy Rolfe) who is recruited by an admiring adversary-the chief of police (Eric Portman)-to undertake a dangerous espionage mission.