Water Rats

When the Nemesis responds to a report of gunshots being fired, Sykes and Quinn come across two teenage boys who have been injured, one fatally, after the gun they were playing with exploded.

Harry, an old fishing buddy of Alex's, appeals to her to find out what happened to his missing son-in-law, Robbo.

A diver shot in the leg leads to the possibility of a hit by the Russian mafia.