Solid Hitch guesswork. It's a dark and windy night (!) Solid citizen Howard's out walking and brushes up against drab Isabel, then trips and falls, bruising himself. The cops grab him, and he finds out Isabel has accused him of assaulting her. He's convicted and goes to prison. After release, he steals money, and then surprise, surprise, starts courting Isabel apparently forgiving her for falsely sending him up. So, what's he up to. Things can't be as they seem.
Dillman's perfect as Howard—respectable, when he should be, and shifty-eyed during darker moments. But is Isabel (a well cast Barrie) as innocent or defenseless as she seems. Worse, does she really think he's forgiven her. But then she is a drab-looking spinster and Howard is a good-looking guy. So maybe she just counts herself lucky. Good to see 40's noir stalwart Edmon Ryan as the cop. Ryan was always either a cop or a gangster—odd how Hollywood casting directors didn't much distinguish the two.
Anyway, if you can overlook a couple of stretches, the results add up to patented Hitchcock suspense.