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 The Venetian Affair (1966), Above Suspicion (1943) and Assignment in Brittany (1943).
Second major film from 20th Century- Fox to have a setting in Salzburg, Austria. The first was The Sound of Music (1965).