A prank call takes the Nemesis out to a harbour-side hotel where Gavin is abducted by a maniacal young man who has a desire to play cop for a day so that he can settle a grievance against those responsible for his brother's imprisonment.
Beneath its surface exists a playground for the murky underworld, a place of illicit rubbish dumps. pollution hazards, the remnants of huge drug hauls, and a graveyard of bodies from years of suicides, accidents and murders. That's the world of the WATER RATS, and elite bunch of 70 brave men and women guarding the harbour against all the elements that threaten to foul the blue waters.