Dr. Clitterhouse, a learned and dignified physician, becomes interested in the study of criminology and decides to find out from actual experience just how the nerves of criminals respond to their misdeeds. Thus, entirely in the interest of science, he becomes a famous bandit, first alone, and then at the head of a gang. Eventually he gets enough material for his book and that is where his difficulties come in. For on the outskirts of the gang and jealous of its success is the wicked fence, Benny Kellerman, who tries to outwit the fine gentleman, but the good manners of the doctor triumph. Dr. Clitterhouse may be a crook, but he is first a gentleman.