Water Rats

This episode opens with the divers searching a dam on a farm. They're assisting a homicide investigation that's tracing the movements of a prostitute who's gone missing.

Webb is slow in coming forward with information regarding the death of Moira Randall - the wife of the armed robber who dobbed in her husband to Webb in Episode 17.

Harrison and the divers arrive at Pitt Town Lagoon to uncover a body found by a Ranger. The body is that of a teenage boy, and is similar in appearance and MO to the murdered teenagers.