Here's another film in the sub-genre that might be called a "Did I Do It." And still another case of "post-murder amnesia."
Singleton, who can't remember anything, even her own first name, is played by Jennifer Jones with a kind of distant unfocused look about her. She is seriously troubled; in addition to her amnesia, she's been the victim of a prank in which Alan Quinton (Joseph Cotten) wrote her Cyrano-like love letters under the name of the lout Roger Morland. She fell in love with the author of the letters, but alas, deceived, married the lout. Now the lout has been murdered and Singleton, blamed for it, is just out of the mental hospital where she was incarcerated. Did she do it? Of course not. She may not have a clue, but Alan and we the audience suspect that she's too pretty and harmless to have done anything bad, let alone committed a murder. Eventually, the truth outs and the real murderer is revealed. Singleton regains her memory and gains the replacement husband (the eloquent Alan that she wanted all along). It's a mighty unbelievable story but whenever amnesia is involved, probability goes flying out the window.
Bosley Crowther, the New York Times film critic at the time, who never liked anything, called it "sentimental twaddle." I myself, once disbelief is not only suspended but obliterated, found it to be a quite an engaging mystery.