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An international criminal arrives in London, and a detective is anxious to pin something on him for some unprovable murders of former lovers. The villain starts to suspect servants and henchmen of being a police spy known as "Number Six".
as Charles Valentine
as Nadia Leiven
as Det. Supt. Hallett
as Jimmy Gale
as Carol Clyde
as Weiland
as Luigi Pirani
as Smith
as Assistant Commissioner
as House Agent
as Det. Sgt. Waters
as Lotte
as Head Waiter
as Mrs. Pirani
as Waiter