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".
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Verdict: Unknown
> Robert Tronson (Director)
> Bert Mason (Director of Photography)
> Ronnie Curtis (Casting Director)
> Gordon Gilbert (Assistant Director)
> Edgar Wallace (Original Story)
> Philip Mackie (Screenplay)
