A man is killed when a speed boat is deliberately driven into the back of his vessel. A friend who was with him at the time identifies the person responsible as a well-known crime figure and an old enemy of Frank's: Marty Miller (Peter Kowitz). Sykes takes part in a training course for police divers. Goldie and Knocker seem to get along very well, and a vietnamese cleaner, Thong, is found dead at the Water Police headquarter.

A hostage is taken and there is a high speed car chase : Marty Miller makes a final stand against Holloway. Internal Affairs suspects Helen of selling information that led to an elderly woman's death. The accusations against Helen makes things bad between her and her lover Anne Harvey

Holloway finds a new lead on Kevin's murder after a young robber is caught with Kevin's missing gun.

Chris Kollias, the man Frank suspects of knowing more about his brother's death than he's saying, goes missing. It seems Frank will be forced to give up trying to find out what really happened the night his brother was forced over The Gap.