The disappearance of a valuable artefact during a performance of the St Jerome school play causes panic among the actors - it belongs to headmistress Quinn. Moon's sister Hazel meanwhile is worried for a different reason - she thinks her chances of kissing the leading man in the final scene could be scuppered if this crucial prop is not found. There is no time to lose. Moon, Red and Mia go backstage to begin their investigations and on discovering that an Inspector Moon has been written into one of the play's scenes, Moon decides to take up the gauntlet making an impromptu appearance on stage. But who did steal the phoenix, and can Moon recover it before it's too late?