Jack Watling
— Dennis Willows
Rona Anderson
— Sallie Harbord
John Horsley
— Peter Hastings
Russell Napier
— Inspector Simmons
Kenneth Kent
— Dr. Julian Cole
Mary Jones
— Florence Cole
Alastair Hunter
— Sgt. Thorpe
Joan Hickson
— Miss Edinger
John Le Mesurier
— Phinneas Tilliard
June Ashley
— Madeline Tilliard
Hélène Burls
— Mrs. James
Charles Hammond
— Juror at Inquest (uncredited)
Edward French
— Bit Part (uncredited)
Peter Gilmore
— Bit Part (uncredited)
Arthur Gross
— Bit Part (uncredited)
Pat Hagan
— Police Officer at Inquest (uncredited)
Neil Hallett
— Police Constable Guarding Hastings' Home (uncredited)
Humphrey Morton
— Usher (uncredited)
Bartlett Mullins
— Coroner (uncredited)
Richard Neller
— Juror at Inquest (uncredited)
Dandy Nichols
— Waitress (uncredited)
Alan Robinson
— Porter (uncredited)
Hugh Stewart
— Policeman (uncredited)
John Wilder
— Police Officer at Inquest (uncredited)