The Sydney Water Police investigate a fatal bombing on a charter ferry while trying to locate other explosive devices that may still be located in the harbour. The Nemesis crew scrambles to recapture a murder suspect who escapes custody. Kevin Holloway, Frank's younger brother, joins Homicide and is partnered with Frank's good friend Knocker Harrison.

A man claiming to have the missing bomb takes hostages on a passenger ferry. Frank and Rachel stake out a yacht to catch a scantily clad burglar. A diver dismissed from duty dives the site of the ferry wreck to locate the fourth bomb in order to eliminate the hijackers threat. Frank's older brother Jimmy is released from prison two years after Frank put him away as part of a drug bust.

A charter boat with children on board explodes. The water police speed to the rescue, but are too late to save a 13-year-old girl. The hunt is on for the arsonist responsible.