The recovery from the harbour of the bodies of two people who died of carbon monoxide poisoning lead detectives to suspect a connection to the activities of Asian gangs. Frank and Rachel are joined by an Asian crime specialist from Task Force Oak to help in the investigation. Hoping to find evidence connecting him to Kevin’s death, Inspector Brady coaxes Frank into doing a preliminary search of Knocker’s house, but when Brady returns with a warrant, all of the implicating evidence has disappeared. Rachel and Knocker announce their engagement.