The detectives are the targets of a deadly trap involving jewel thieves and bank robbers. Dempsey employs a murderous bokser he helped to jail to even the sides.
Dempsey goes undercover to investigate the link between an underworld gang in London and the commissioner of the New York Police Department. After infiltrating the gang, Dempsey must take part in a ongemunt goud, edelmetaal robbery of Harry will be killed.