"Adrian Messenger, a famous writer, asks his friend Anthony Gethryn, a former British agent, to help him investigate the whereabouts of the people who appear on a list, without asking him the reason why he should do so."
George C. Scott
as Anthony Gethryn
Kirk Douglas
as George Brougham / Vicar Atlee / Mr. Pythian / Arthur Henderson
Dana Wynter
as Lady Jocelyn Bruttenholm
Clive Brook
as Marquis of Gleneyre
Gladys Cooper
as Mrs. Karoudjian
Herbert Marshall
as Sir Wilfrid Lucas
Jacques Roux
as Raoul Le Borg
John Merivale
as Adrian Messenger
Marcel Dalio
as Max Karoudjian
Bernard Archard
as Pike
Tony Huston
as Derek Bruttenholm
Ronald Long
as Sir Robert Carstairs
Tony Curtis
as Organ Grinder
Burt Lancaster
as Protester
Robert Mitchum
as Slattery
Frank Sinatra
as Gypsy
Noel Purcell
as Countryman (uncredited)
Richard Peel
as Flood (uncredited)
John Huston
as Lord Ashton (uncredited)
Bernard Fox
as Lynch (uncredited)
Anita Sharp-Bolster
as Mrs. Slattery (uncredited)
Director
Anthony Veiller
Screenplay
Joseph MacDonald
Director of Photography
Jerry Goldsmith
Original Music Composer
Executive Producer
Bud Westmore
Makeup Designer
Terry O. Morse
Editor
Oliver Emert
Set Decoration
Richard McWhorter
Unit Production Manager
George C. Webb
Art Direction
John Chambers
Makeup Artist
Alexander Golitzen
Waldon O. Watson
Sound
Nick Marcellino
Edward Lewis
Producer
Edward Scaife
Philip MacDonald
Story
Frank H. Wilkinson
Edward Muhl
Production Manager
Dave Grayson
Stephen B. Grimes
Tom Shaw
Assistant Director