Two of a Kind (1951) review

Blonde baddie Brandy (Lizabeth Scott), on orders from crooked lawyer (and occasional lover) Vincent Mailer (Alexander Knox), goes searching for Michael "Lefty" Farrell (Edmond O'Brien) and convinces him to take part in their plan to have Farrell convince business tycoon William McIntyre (Griff Barnett) he's his long-lost son in order to inherit the family fortune.  There are quite a few mediocre noirs buried in Hollywood's attics but I think this is a severely underrated gem, as it's far better thought-out than most B-movies from the era (cramming it all in a mere 75 minutes) and the cast is excellent, especially Terry Moore as Farrell's ditzy and fickle love interest who doesn't care about money and thinks she can "reform" criminals with affection.  Even the last act, which seems like it's getting ready for a murder or two, ends up blood-free and justice is restored ... plus, all it takes for O'Brien's character to get the girl is to lose his finger: that's a solid trade-off.