Edward G. Robinson, Claire Trevor, Humphrey Bogart, Allen Jenkins, Donald Crisp, Gale Page, Henry O'Neill, John Litel, Thurston Hall, Ward Bond, Ronald Reagan, Mary Field, Maxie Rosenbloom, Vladimir Sokoloff, Bert Hanlon
A wealthy society doctor decides to research the medical aspects of criminal behaviour by becoming one himself. He joins a gang of thieves and proceeds to wrest leadership of the gang away from it's extremely resentful leader.