"Con man Dudley Jerico sets out to rob corrupt millionaire Victor Rosso of his legendary Gemini diamond, but there's another operator in town who is out to con the con."
Patrick Macnee
as Dudley Jerico
Connie Stevens
as Susan Gray / Claudine / Georgina
Herbert Lom
as Victor Russo
Marty Allen
as Wally
Leonardo Pieroni
as Angelo
Peter Yapp
as Felipe
Bruce Boa
as Nolan
Joanne Dainton
as Merle
Paul Darrow
as Receptionist
Jasmina Hilton
as Maid
June Cooper
as First Stewardess (uncredited)
Nancy Egerton
as Second Stewardess (uncredited)
Anne Godfrey
as Elegant Lady (uncredited)
Michael Stevens
as Hotel Bartender (uncredited)
Nikki Van der Zyl
as Claudine (voice) (uncredited)
Joe Wadham
as Harry, Nolan's Man (uncredited)
Philip Levene
Writer
Barry Delmaine
Associate Producer
Julian Wintle
Producer
Laurie Johnson
Original Music Composer
Alan Hume
Director of Photography
Lionel Selwyn
Editor
Harry Pottle
Production Design
Art Direction
Bill Griffiths
Hairdresser
Bunty Phillips
Makeup Artist
Ray Frift
Production Manager
Ivor Powell
Assistant Director
William Green
Construction Manager
A. W. Lumkin
Recording Supervision
Denis Porter
Sound Recordist
Dennis Whitlock
Sound Mixer
Alan Willis
Sound Editor
Sound Supervisor
Ivan Pulis
Stunt Double
Roy Vincente
Stunts
Tony White
Camera Operator
Laura Nightingale
Wardrobe Master
Conductor
Marjorie Lavelly
Continuity
Sidney Hayers
Director
David T. Chantler
Story