What makes a criminal tick? For Dr. Clitterhouse, there's only one way to find out. Eager to study the physical and mental states of lawbreakers, he joins a gang of jewel thieves. Edward G. Robinson plays the title role, giving his thuggish screen persona a sly comic kick. Claire Trevor costars as a savvy crime queen. And Humphrey Bogart plays Rocks Valentine, an ice-blooded tough the doc calls "a magnificent specimen of pure viciousne
