Margaret Lockwood

Character: Helene Ardouin

Hugh Sinclair

Character: Inspector Calas

James Mason

Character: Andre Laurent

Raymond Lovell

Character: Prof. Winkler

Rodney Ackland

Character: Winker's Assistant

Enid Stamp-Taylor

Character: Dany

Hartley Power

Character: Gordon

Jane Carr

Character: Delia

Edana Romney

Character: Winkler's Assistant