When a pet detective is found dead inside the kennel of a dog he is searching for, Barnaby and Winter are drawn into the world of dognapping, cat seduction and animal investigation. Guest stars include Andrew Scarborough (Downton Abbey).

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.