How do you solve a murder when hundreds of wannabe detectives have the same goal? Every year, fans from all over the world descend upon a tiny picturesque English village to celebrate the life of the enigmatic author Agnes Crabbe and her fictional detective, Miss Millicent Cutter. Crabbe fans are quite obsessive; the majority turn up to the festival dressed as Miss Cutter. Spats between rival fan clubs are not uncommon. But when one of the most prominent superfans is murdered on the first day of the festival, the police find themselves trying to solve a crime in which the victim, witnesses, almost everyone in the village, and even the murderer, are all dressed as Miss Cutter. And most of them are also trying to solve the murder ...