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 viciousness." The movie also marks the start of one of film's most noteworthy collaborations: John Huston, who later directs Bogart in The Maltese Falcon, The Treasure of the Sierra Madre and The African Queen, cowrote the screenplay of The Amazing Dr. Clitterhouse.