Jack Warner as Det. Insp. Fred Fellows

Yolande Donlan as Jean Sherman

Michael Goodliffe as Clyde Burchard

John Le Mesurier as Mr Simpson

John Barron as Ray Tenby

Moira Redmond as Joan Simpson

Christine Bocca as Mrs Simpson

Brian Oulton as Restlin

Ray Barrett as Sgt Gorman

Norman Chappell as Andy Roach

Joan Newell as Mrs Banks

Ronald Lewis as Det. Sgt. Jim Wilks

Peter Ashmore as Mr. Bunnell (uncredited)

Timothy Bateson as Porter (uncredited)

Geoffrey Bayldon as Constable at Murder Scene (uncredited)

Basil Beale as Police Clerk (uncredited)

Gerald Campion as Glazier (uncredited)

Reginald Marsh as Hilders (uncredited)

Fred Ferris as Information Sergeant (uncredited)

John Horsley as Supt. Ramsey (uncredited)

Clifford Earl as 2nd Press Man (uncredited)

Charles Houston as Garage Foreman (uncredited)

Julie Samuel as Lois (uncredited)

Robert Raglan as Chief Constable (uncredited)

Graham Skidmore as 1st Press Man (uncredited)

Kevin Stoney as Mr. Gardner (uncredited)

Charles Lamb as Mr. Peck (uncredited)

Marianne Stone as Secretary (uncredited)

Geoffrey Russell as Chief Superintendent (uncredited)

Mike Moyer as Driver PC Harris (uncredited)

Michael McStay as Police Operator (uncredited)

Graham Payn as Mr. Blake (uncredited)