Underrated Hitchcock thriller based on the best-selling book by Leon Uris, author of the (also filmed) Exodus. Keep your thinking caps on for the incredibly complicated plot and you'll be gripped throughout, even though Hitch's characteristic lightness of touch sometimes deserts him, leading to variable pacing. Frederick Stafford is adequate in the lead; a great supporting cast includes top French character stars Michel Piccoli and Philippe Noiret.