"A famed trumpet player is suspected of murdering a blues singer. Using only two minor clues, he narrows the suspects to four people, but only after surviving poison placed on the mouthpiece of his trumpet!"
Alex Nicol
as James Bradley
Eleanor Summerfield
as Barbara Quigley
John Salew
as Maxie Margulies
Paul Carpenter
as Johnny Sutherland
Geoffrey Keen
as Maurie Green
Ann Hanslip
as Maxine Halbard
Fred Johnson
as Det. Sgt. MacKenzie
Martin Boddey
as Insp. Mulrooney
Arthur Lane
as Jeff Colt
Paula Byrne
as Gloria Lewis Colt
Leo Phillips
as Dresser
Freddie Tripp
as Stage manager
Frank Birch
as Trumpet Salesman
Jeremy Hawk
as Recording Technician
James Carney
as Barman Mickey
Melvyn Hayes
as Hotel Bellhop
Terence Fisher
Director
Ernest Borneman
Screenplay
Novel
Kenny Baker
Music Director
Ivor Slaney
J. Elder Wills
Art Direction
Mickey Delamar
Production Manager
Bill Salter
Sound Recordist
George Burgess
Jimmy Sangster
Assistant Director
Renée Glynne
Continuity
Len Harris
Camera Operator
Philip Leakey
Makeup Artist
Nina Broe
Hairdresser
Molly Arbuthnot
Wardrobe Master
Michael Carreras
Producer
Walter J. Harvey
Director of Photography
Maurice Rootes
Editor