Nei bassifondi di San Francisco

To confront the spies and the hitmen of El Supremo, Tex calls up his friends in San Francisco: police chief Tom Devlin, the owner of the Alameda Hotel and former cop, Mike Tracy, and all the strong man of the Hercules Gym, led by Lefty Potrero, Bingo and Angelo. The outcome? A maelstrom of coup de théâtre, chasings, gunfights and whacking blows to try and foil the plan of the shadily dangerous Nick Castle! The man flees at see, toward a mysterious island, and only two brave men, disguised as El Supremo hunchmen, manage to follow him...