Dr Burgess, on his way home from a party at the glamorous Francesca Ward's riding school, knocks a stranger down in the road at Newton Magna, and the stranger mysteriously vanishes. Barnaby identifies the missing man as Sean O'Connell, a disgraced Irish vet, then he recognizes the village's new squire as Melvyn Stockard, a retired villain. A body found in a well proves to be the father of the man Stockard's daughter is about to marry... everyone knows he was against the marriage, but is Stockard a killer, and where does the missing Irishman fit in?

When a traditional festival is revived at Midsomer Parva, it goes disastrously wrong, with the curate (or assistant priest) being burnt alive inside a straw effigy of a woman. Local property owner Alan Clifford holds a party at the Manor House, and it seems he has secrets... And then, just after finding a pig's head on the altar of the parish church, the dead curate's gay lover, the Reverend Jim Hale, dies too, seemingly of 'spontaneous combustion' - that is, he bursts into flames without any normal explanation. Barnaby refuses to believe in rumours of witchcraft and is vindicated when it proves that Hale's clothes had been sprinkled with phosphorus. Then, with Barnaby hot on the killer's trail, Liz Francis is knocked out with a candlestick and becomes the third villager to be burnt alive.