This movie hits all the buttons for Film Noir, and I'm willing to call it so. There are lots of earlier movies with elements that finally fused together to make Film Noir, and many movies that almost hit it around this time (like THE MALTESE FALCON), but Noir was a movement, and it's not leaders that make movements, it's followers, like Jack Hively, the B director of this one.
Burgess Meredith is walking down the street when he is knocked down by some rubble from a demolition job. When he gets up, he finds a cigarette case and hat with the wrong initials, and when he goes home, wife Louise Platt tells him he has been missing for more than a year. He goes to the office to get his job back, only to find Sheldon Leonard in hot pursuit. When he goes back to the part of town where he regained his memory, there Claire Trevor is, telling him to get off the street. He's her man and he's wanted for murder.
It's based on one of Cornell Woolrich's overwrought crime novels and, as usual, Burgess Meredith plays a nice, amiable fellow, rather wasted. Claire Trevor has all the good lines, and Sheldon Leonard is fine in a straight role. Despite that voice, meant for Runyonesque hoods, he was a good actor.
If the answer to the mystery is milked a bit to make the movie last a few minutes longer, the answer still came as a surprise to me. I expect you'll enjoy it, not only for its early, pure Noir, but for a fairly played, if mildly hysterical, mystery.