After Police Captain Dan McLaren becomes police commissioner, former detective Johnny Blake publicly punches him, convincing rackets boss Al Kruger that Blake is sincere in his effort to join the mob. "Bugs" Fenner, meanwhile, is certain that Blake is a police agent.
Mad scientist injects his enemies with acromegaly virus, causing them to become hideously deformed.
A reporter turned tax agent infiltrates a crime ring to catch a racketeer, working with the mobster's bookkeeper. When she agrees to testify, an informant exposes them and she's kidnapped.
