Dirk Bogarde
Nicholas Whistler
Sylva Koscina
Vlasta Simoneva
Robert Morley
Col. Cunliffe
Leo McKern
Simoneva
Roger Delgado
Josef
Derek Fowlds
Sun Bathing Man
Eric Pohlmann
Golushha
John Le Mesurier
Roger Allsop
Noel Harrison
Johnnie
Amanda Grinling
Cunliffe’s Secretary
Philo Hauser
Vicek
John Junkin
Clerk in Opening Scene
Jill Melford
Lorna
Derek Nimmo
Fred
Richard Vernon
Roddinghead
Brook Williams
Leon
Gertan Klauber
Technician in Czech Glass Factory
Richard Pasco
Plakov
Alan Tilvern
Simenova's Assistant
Norman Bird
Employment Exchange Clerk
Andre Charisse
Waiter
Frank Finlay
British Embassy Porter
Sandra Hampton
Russian Dancer
Harriet Medin
Hotel Receptionist
William Mervyn
Passenger on Plane
Tiberio Mitri
The Milkman
George Pravda
Pravelko
Robert Rietti
John Standing
Men's Room Attendant
Eddie Boyce
Man in Labour Exchange
Jim Brady
Worker in Canteen
Igo Meggido
Russian Dancer (uncredited)
Reg Thomason
Diner in Restaurant (uncredited)
Pietro Tordi
Old man at the swimming pool (uncredited)
Lionel Davidson
Novel
Ralph Thomas
Director
Syd Cain
Art Direction
Yvonne Caffin
Costume Design
Angelo Francesco Lavagnino
Original Music Composer
Betty E. Box
Producer
Ernest Steward
Director of Photography
Lukas Heller
Screenplay
Alfred Roome
Editor
W.T. Partleton
Makeup Artist
Stella Rivers
Hairdresser
Giorgio Gentili
Assistant Director
Simon Relph
Assistant Director
Don Sharpe
Sound Editor
John W. Mitchell
Sound Recordist
Bill Daniels
Sound Recordist
James Bawden
Camera Operator
Earl St. John
Executive Producer