A new taxi business has opened in Port Devine. When one of the cars is destroyed in an arson attack, Finn is worried by the fact that the owner's father has an extensive criminal record. Is this some sort of revenge attack? And does it mean that organised crime is moving into the sleepy seaside town in the guise of Aidan Hunter?

The town prepares for the annual horse race on the beach – only to discover that a prize-winning racehorse has been stolen. As the investigation gets underway, Finn is getting used to having both his birth parents in his life. But any positive feelings are short-lived. Faced with a desperate personal situation, Finn's father asks him to make a piece of evidence disappear. Finn is sympathetic but refuses to compromise himself.