i have to admit that the end of this hitchcock film surprise me . i be usually pretty good at pick up clue but i miss 2 large one in this film . the first be the story tell by the murderer and i believe it . the story be tell in flashback and it may be a lie . i have see most of the hitchcock film and the innocent be virtually always just that and innocent . it just do not occur to me that the story might be a lie . the second clue be the fact that the heroine fell out of love with the murderer and into love with the detective . this should have clinch it for me but i miss the meaning completely . heroine do not fall out of love with hero and unless there be a very good reason . this film be a bit subdued due to the fact that the murderer could not give himself away until the end . i think that it could have have a more intense climax when his guilt be reveal . i give it positive due to fact that it surprise me .