When hordes of people descend on the picturesque village of Nasely for the annual celebration of its most famous resident, murder mystery writer Agnes Crabbe, events take a dark turn as the festival opens with a shocking death.

Each year the residents are outnumbered by crowds dressed as Crabbe's best-known character, the lady detective Millicent Cutter. The weekend is never a mild-mannered affair as fan club rivalries bubble below the surface, but tensions reach new heights when a second Crabbe devotee is found murdered. Though the police are quick to arrive on the scene, the facts are tricky to ascertain as the witnesses, suspects and victim are all dressed as Miss Cutter. And they all want to solve that crime too . . .