Leslie Banks as Dr. Manetta

Lilli Palmer as June Lansdowne

Cathleen Nesbitt as Ann Cody

Gina Malo as Glenda Baker

David Horne as Edward Havelock

Romilly Lunge as Dick Martin

Richard Bird as Inspector Cornelius 'Andy' Sneed

J.H. Roberts as Luis Silva

Aubrey Mallalieu as Lord Charles Francis Selford

Harry Hutchinson as Bevan Cody

Phil Ray as Tom Cawler

George Street as Chief Commissioner

Ross Landon as John Selford

Raymond Mander as P.C. in Sneed's Office (Uncredited)

Charles Paton as Handwriting Expert (Uncredited)

George Street as Chief Commissioner (Uncredited)