Plot hole: The ending relies on Tony knowing where the key is on the stairs and Margot not knowing. Unfortunately there are any number of reasons for him knowing about a backup key that do not mean he is a murderer, and she could be smart enough to know she is certainly under police surveillance (and custody) and not touch the key on the stairs. Tony could easily make the argument that he had one made as a backup and put it there. Swann could have followed him one day and saw it and used it. His knowing the location of the key certainly does not necessarily mean he hired a hitman.
Margot Mary Wendice: How long have you known this?
Chief Insp. Hubbard: Did you suspect it yourself?
Margot Mary Wendice: No, never. And yet... What's the matter with me, Mark? I don't seem able to feel anything.
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