This is the gold standard for enjoyable mystery movies; only "The Lady Vanishes" comes close. Unlike many films which maintain the mystery by deceptive filming or editing, in this one you know just what the central character (Laughton) knows at all times, and you unravel the facts along with him. You are never quite sure how much you don't know, right to the end. Laughton and Lanchester are delightfully amusing without detracting in the least from the main story line. Tyrone Power is convincing and Marlene Dietrich is at her peak - not only as a fascinating woman but a startlingly effective actress. It's hard to say any one role of Charles Laughton's is his best - he gave himself so much competition - but this is probably the one you will want to watch again and again.