Here's a film I've obviously overlooked more than most, because until a few days ago I had never heard of it. But with this cast, how bad could it be? It's now high on my list of wanna sees.
IMDb describes it thusly: Dr. Clitterhouse is fascinated with the working of the criminal mind. His interest is so deep that he finds the best way to observe criminals in action is to become one himself! Whilst robbing a safe at an exclusive party he stumbles across an organized gang trying to do the same thing. He teams up with the gang to observe them action but one of the members, Rocks Valentine (Humphrey Bogart) would like nothing better than to see Clitterhouse out of the way.