
A serial killer terrorizes London. Each victim is found with a telegram signed "The Marquis." There seems to be no other common thread between the victims, and Scotland Yard is baffled. Novelist and amateur sleuth, Paul Temple, is warned to stay away from the case, but he and his glamorous wife Steve can never refuse a good mystery.
Cast

John Bentley
Paul Temple

Patricia Dainton
Steve Temple

Peter Gawthorne
Sir Graham Forbes

Valentine Dyall
Bradley

Ronald Leigh-Hunt
Inspector Ross

Grey Blake
Storey

Dan Jackson
Sakki the Valet
Ben Williams
Roddy Carson

Robert Urquhart
Slater

Christopher Lee
Sir Felix Raybourne
George Patterson
Servant Abdullah

Michael Mulcaster
Sir Graham's Police Aide, Police Sergeant

Andreas Malandrinos
Sammy Wren
Margaret Samuel
Rita Cartwright
Elizabeth Gilbert
Barmaid

Vi Kaley
Old 'Em
Gerald Rex
Rifle-range Attendant
Sylvia Pugh
Secretary
Denis Holmes
Mobile Policeman
John Adams
Police Constable
Joe Wadham
Pinball Machine Player
Crew
Maclean Rogers
Director
Francis Durbridge
Writer
Jim Connock
Editor
Geoffrey Faithfull
Director of Photography
Ernest Morris
Assistant Director
Ernest G. Roy
Producer
Dudley Lovell
Camera Technician
Evelyn Gibbs
Wardrobe Master
Jayne Seymour
Hairdresser
Bill Lodge
Makeup Artist
Charles Tasto
Sound Recordist
Wilfred Burns
Original Music Composer, Conductor
Adele Reynolds
Continuity
Abner J. Greshler
Presenter
E.S. Laurie
Production Manager
George Paterson
Art Direction
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The Verdict