Jack Hawkins wasn't always renowned for the subtlety of his performances, but he does manage that well here. In this quite plausible adaptation of AP Scotland's fact-based book, he portrays a German officer who works his way up the ranks, ultimately to reach staff rank in the Nazi army - whilst passing on secrets to the British for almost 30 years. The direction is suspenseful and it maintains the tension well - especially towards the end. This is rarely seen, nowadays, but is eminently watchable.
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