Charley plays a soda jerk who spends all of his time reading detective stories in magazines. He's done so much reading that he even thinks he knows more than the cops. In particular, he behaves like a fat-head and insists he could catch the crook, Lucky Lapitas, if he tried. Naturally, Lapitas himself comes into the pharmacy soon after and Charley has absolutely no idea who he is. Heck, he even helps Lapitas by helping him find an apartment and later by getting the Chief of Police arrested when Charley tells a cop that the guy is Lapitas--and the real one is standing right by him.
This first portion of the film is very good. However, after Lapitas is caught and then escapes, the film slows down considerably. Charley soon is posing as a blind man (????) and the story loses traction. Still, the first half is so strong that it is well worth seeing despite the lull.