Trevor has succeeded in finding the music he's been looking for and Jill's campaign is reaching fever pitch. But who is the mysterious supergrass and the woman 'with a past'? Will the truth ever be revealed to Det Sgt Hobson?

Somehow, a bizarre twist of fate plunges the couple into a mystery involving bureaucracy and death threats. All is revealed in this final episode: will Hobson find fame and glory, will Trevor and Jill find true happiness, and will Mr Carter ever really understand his two teaching colleagues?