Halloween in the beautiful county of Midsomer finds itself overshadowed by a trick or treat that takes a nasty turn. Sara McLower answers the door, and finds her life ended by a pumpkin. When villagers gather a few weeks later for her funeral, there's an understandable sense of unease. Still, there's the festive lights switch-on to look forward to at The Windy Dog pub, overseen as always by longstanding landlady Betty Grainger. But when she flicks the light switch, it'd be fair to say that things go with a bit of a bang. It leaves not one but two serious crimes to investigate - which is where you come in.