Primus is attacked by mysterious scuba men. He fends them off, retaining a canister they dropped containing Heroin. The Orca comes under attack by a gangster named Yang. Primus is knocked out and awakens to find himself tied up and the Orca rigged to explode. He escapes and sets off to find Yang and the kidnapped Toni. Primus is captured and taken to Yang who agrees to let he and Toni live if he'll deliver the heroin and bring back the seven million dollars. Primus agrees but slips a bomb into the drugs which destroys the plane. With the help of Toni Primus captures Yang and his gang.
Professor John Wilmore in a daring rescue of some trapped workers trapped in a tunnel in the East River after an explosion. He works to save them and even has to make one last daring swim to save a man who has gotten separated from the others. His girl impressed she offers him breakfast.
Primus finds a .38 Magnum while searching for stolen jewels in a dirty canal. Two thugs who threw it away see him retrieve it and intend to get it back. Primus is attacked that night but manages to throw the mobster into the canal. The next day Primus and Toni give the gun to the police and learn that the two criminals work for a gambling bigwig named Marvin Schwartz. Primus goes to the estate of Frenchy Smith a rival criminal and finds him shot dead. Primus escapes and tricks the gang into driving their boat into shallow water.