Guy Hamilton Director Herbert Lom Maurice Meister Actor Donald Wolfit Dr. Lomond Actor Mai Zetterling Lisa Actor Greta Gynt Cora Ann Milton Actor William Hartnell Sam Hackett Actor Norman Wooland Inspector Bliss Actor Denholm Elliott John Lemley Actor Dora Bryan Mrs Hackett Actor Charles Victor Inspector Wembury Actor Walter Fitzgerald Commissioner Actor Lesley Storm Writer Val Valentine Writer Hugh Perceval Producer Malcolm Arnold Music Edward Scaife Film Editor