 A vicious loan shark ring has been preying on factory workers. When several workers at a tire factory suffer violence at the hands of the loan sharkers, a union leader and the factory owner try to recruit ex-con Joe Gargan to infiltrate to the gang. At first Joe does not want to get involved, but changes his mind when his brother-in-law dies at the hands of a savage loan shark hood. Joe works his way into the mob, but in order to keep his cover, Joe can t tell anyone what he is up to. This results in him being disowned by his sister and girl friend.