"In this contemporary update of Frank H. Spearman's Western hero, Whispering Smith is now a sleuth who arrives in London on holiday, but is soon called in to solve the case of a suicide which the father of the deceased woman thinks was murder."
Richard Carlson
as Steve Smith ("Whispering Smith")
Greta Gynt
as Louise Balfort
Herbert Lom
as Roger Ford
Rona Anderson
as Anne Carter
Alan Wheatley
as Hector Reith
Dora Bryan
as Miss La Fosse
Reginald Beckwith
as Manson
Daniel Wherry
as Dr. Taren
Michael Ward
as Hotel Desk Clerk
Danny Green
as Cecil
James Raglan
as Insp. Dave Meeker
Stuart Nichol
as Martin
Laurence Naismith
as Parker
Christine Silver
as Mrs. Pearson
Vic Wise
as Maxie
Middleton Woods
as Station Porter
Ben Williams
as Taxi Driver
Sidney Vivian
as Hotel Porter
Toni Frost
as Secretary
June Nardsley
as Maid
Michael Hogarth
as Police Constable
John Wynn
as Police Sergeant
Anthony Warner
as Page Boy
Ian Wilson
as Small Tough
Stanley Baker
as 1st Reporter
Lionel Grose
as 2nd Reporter
John Singer
as 1st Photographer
John Kyle
as 2nd Photographer
Francis Searle
Director
Frank H. Spearman
Characters
John Gilling
Story
James Needs
Editor
Arthur Barnes
Production Manager
Renée Glynne
Continuity
Jack Miller
Sound Recordist
Philip Leakey
Makeup Artist
Anne Box
Hairstylist
Jimmy Sangster
Assistant Director
Michael Carreras
Casting
Walter J. Harvey
Director of Photography
Peter Bryan
Camera Operator
Frank Spencer
Music
Anthony Hinds
Producer
Writer