Perfect Ending
I never believed that story that has been circulated for years. Largely because I can't believe Hitchcock would cast and make a film while being blocked at every turn, only to have to comply with an incoherent ending. More importantly,, I can't believe that Hitchcock would make an obvious murder movie with an obvious murderer. The book sounds trite and the concept already dominated the book and film industry of that era. Cads who married for money and murder. Femme fatales who married and murdered for money. Film Noir was riddled with that overdone story.
No Hitchcock made exactly the movie he intended to make, infinitely more interesting than the book he borrowed from. The ending was just perfect and a reminder not to completely judge a book by its cover. Johnny Aysgarth was many things, but he loved his wife and was not a murderer.