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