Last episode in the unbelievable eighteenth series of Midsomer Murders tonight sees the annual harvest fair arrive in the village of Whitcombe Mallet. However, when an owner of an equestrian centre is trampled by his horse, DCI Barnaby and DS Nelson, along with the expertise of forensic pathologist Kam Karimore, must unravel a complex feud from the past. However, nothing is as it seems, and they are in a race against time as they work to solve the case.