"Scotland Yard detectives hunt for a dangerous criminal who has recently returned to England."
Patric Curwen
as Dr. Lomond
Esmond Knight
as John Lenley
John Longden
as Inspector Wembury
Carol Goodner
as Cora Ann Milton
Gordon Harker
as Samuel Hackett
Franklin Dyall
as Maurice Meister
Dorothy Bartlam
as Mary Lenley
Henry Hallatt
as Inspector Bliss
Arthur Stratton
as Sgt. Carter
Kathleen Joyce
as Gwenda Milton
Eric Stanley
as Commissioner
Walter Forde
Director
Angus MacPhail
Writer
Robert Stevenson
Edgar Wallace
Novel
Sidney Gilliat
Additional Dialogue
Michael Balcon
Producer
Leslie Rowson
Director of Photography
Alex Bryce
Ian Dalrymple
Editor
Norman G. Arnold
Set Designer
Harold V. King
Sound
Rosaire Rutland
Continuity
Bryan Edgar Wallace
Production Manager
