Number Six
Plot: 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
Nadja Regin
Michael Goodliffe
Brian Bedford
Joyce Blair
Leonard Sachs
Harold Goodwin
John Welsh
Barrie Ingham
Derrick Sherwin
Robert Tronson
Edgar Wallace