Water Rats

Sykes rescues a woman who falls off a paddleboat and as a reward, she wants to take him to New Zealand. A woman contacts Rachel with her concerns about her daughter's new boyfriend.

While the boat crews are kept busy responding to a series of suicide hoaxes, Frank and Rachel play host to a detective from Scotland Yard who has been sent to take possession of the diamonds.

The boat crew's discovery of a man who has had his hand nailed to a tree by his neighbour leads the detectives into the investigation of his wife's disappearance and as they later learn, murder.