Det. Insp. Fred Fellows

Jack Warner

Det. Sgt. Jim Wilks

Ronald Lewis

Jean Sherman

Yolande Donlan

Clyde Burchard

Michael Goodliffe

Mrs. Simpson

Christine Rocca

Mr. Simpson

John Le Mesurier

Ray Tenby

John Barron

Joan Simpson

Moira Redmond

Mrs. Simpson

Christine Bocca

Frank Restlin

Brian Oulton

Sgt. Gorman

Ray Barrett

Andy Roach

Norman Chappell

Mrs. Banks

Joan Newell

Sgt. Unwin

Geoffrey Frederick

Mr. Bunnell (uncredited)

Peter Ashmore

Porter (uncredited)

Timothy Bateson

Constable at Murder Scene (uncredited)

Geoffrey Bayldon

Police Clerk (uncredited)

Basil Beale

Hilders (uncredited)

Reginald Marsh

Glazier (uncredited)

Gerald Campion

Mr. Blake (uncredited)

Graham Payn

Information Sergeant (uncredited)

Fred Ferris

Chief Constable

Robert Raglan

Supt. Ramsey (uncredited)

John Horsley

2nd Press Man (uncredited)

Clifford Earl

Dr. MacFarlane

Robert Moore

Garage Foreman (uncredited)

Charles Houston

Lois (uncredited)

Julie Samuel

Luggage Clerk

Harry Brunning

1st Press Man (uncredited)

Graham Skidmore

Secretary (uncredited)

Marianne Stone

Mr. Gardner (uncredited)

Kevin Stoney

Mr. Peck (uncredited)

Charles Lamb

Chief Superintendent (uncredited)

Geoffrey Russell

Driver PC Harris (uncredited)

Mike Moyer

Police Operator (uncredited)

Michael McStay