The Midsomer Mummers, an amateur opera company, is in the middle of rehearsals for a charity concert, when a dead body is found in the theatre. The aim of the inquiry will be to find out who is most desperate to be the center of attention. Guest stars include Kevin Whately (Inspector Lewis; Inspector Morse).

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.