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