I just bought this and was looking forward to watching as I like all the main actors and am a film noir fan. This title is being marketed as a film noir - it's a good movie - but it definitely isn't a noir. I certainly don't stick to the narrow definition of a noir either.
I won't bother to write a whole synopsis since that has been covered by earlier posts. Edward G Robinson never disappoints (even though he does kind of sound like Chico Marx in this) and Richard Conte is great. I hadn't seen Luther Adler in anything before but he was perfect in the role of the scorned older brother.
Like I said it is a good movie...just don't expect a noir.