Water Rats

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. The detectives have to ask themselves, have they arrested the wrong man when they put Ross Beale away? Then there's another boy who's been missing for two days - a fourteen year old intellectually handicapped son of a police officer. Will someone give some answers in time to find him before he becomes victim number five?