Don Siegel Director, Producer Michael Caine Maj. John Tarrant Actor Donald Pleasence Cedric Harper Actor Delphine Seyrig Ceil Burrows Actor Clive Revill Alf Chestermann Actor John Vernon McKee Actor Joss Ackland Chief Supt. Wray Actor Janet Suzman Alex Tarrant Actor Catherine Schell Lady Melissa Julyan Actor Joseph O'Conor Sir Edward Julyan Actor Denis Quilley Bateson Actor Derek Newark Monitoring Policeman Actor Edward Hardwicke Mike McCarthy Actor Maureen Pryor Jane Harper Actor Joyce Carey Miss Monley Actor Preston Lockwood Ilkeston Actor Leigh Vance Screenwriter Ousama Rawi Cinematographer Roy Budd Music Antony Gibbs Film Editing Peter Murton Art Director Anthony Mendleson Costume Design Freddie Williamson Makeup Eva Monley Production Manager