Sarah Massey, talented lead actress in Circus Sweethearts, is a mess. She should be dancing on air—after all, her boyfriend just proposed. But she has lost his gift: a beautiful emerald necklace with a storied history. Rumor has it whoever loses the necklace will be cursed, and now everything around Miss Massey is falling apart. She turns to Maisie Hitchins and her dog, Eddie, for help. But when Maisie shows up at the London theater, things only get stranger. Maisie begins to wonder if it's really the lost emerald causing all of these problems, or if someone in the troupe is green with envy.