Robert Tronson (Director) · Philip Mackie (Screenplay)
Ivan Desny
Charles Valentine
Nadja Regin
Nadia Leiven
Michael Goodliffe
Det. Supt. Hallett
Brian Bedford
Jimmy Gale
Joyce Blair
Carol Clyde
Leonard Sachs
Weiland
Maxwell Shaw
Luigi Pirani
Harold Goodwin
Smith
John Welsh
Assistant Commissioner
Barrie Ingham
House Agent
Derrick Sherwin
Det. Sgt. Waters
Malou Pantera
Lotte
Andre Mikhelson
Head Waiter
Josephine Gordon
Mrs. Pirani
Norman Florence
Waiter
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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".
