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".
Ivan Desny
Charles Valentine
Nadja Regin
Nadia Leiven
Michael Goodliffe
Det. Supt. Hallett
Brian Bedford
Jimmy Gale
Joyce Blair
Carol Clyde
Leonard Sachs
Weiland