Trivia

Film debut of Klaus Maria Brandauer.

Final film score by Bronislau Kaper. NOTE: Most of his music was rejected and replaced by stock cues.

Fourth screen adaptation of a novel by Helen MacInnes. The others were Intriga en Venecia (1966), Bajo sospecha (1943) and Cita con el peligro (1943).

Second and final film as a producer of Ingo Preminger, brother of Otto Preminger.

Final film of Karen Jensen, though she continued to work in television for the rest of the decade.