Causton villagers take a bus trip to visit a seaside resort in Brighton, for a ceremony. A serial killer, decapitates some travelers both in Causton and Brighton. DCI Tom Barnaby's cousin, DCI John Barnaby, work together to solve the case.
A tailor dies of a heart attack. Two years later, his widow is murdered on her way to the vicarage. The vicar is also murdered after receiving a mysterious letter.
A Wild West show comes to Ford Florey and a serial killer starts to eliminate villagers in a "wild west" fashion related to a parcel of disputed swamp land.
Jeff Bowmaker runs a profitable business in Midsomer Magna conducting spooky "ghost tours" at night when the unpopular village librarian turns up dead.
A group of conservationists object to the development of a pristine part of the village and adherents from both sides become victims of a mysterious killer.