In Midsomer Wellow, the church bell-ringers are being murdered one by one. In hopes of winning a national striking competition, the determined bell group continues with rehearsals despite the growing number of deaths. As each is murdered, the killer leaves a line from a nursery rhyme by the body, though one of these notes has been altered to allude to a long-ago incident in Midsomer Wellow's past. Barnaby and Troy must find the connection between this note and a past Midsomer Wellow murder to stop one villager's quest for bloody revenge. Guest stars: Hugh Bonneville (Downton Abbey) and Graham Crowden (Waiting For God).

The town of Causton's detective chief investigator and his detective sergeant investigate the scandals and deadly deeds that lurk just beneath the well-manicured surface of the county of Midsomer. The series is bolstered by a rotating cast of investigators and many special celebrity appearances.