Five years ago, Cambridge Ballet’s Sugar Plum Fairy vanished after performing The Nutcracker. Despite extensive searches, no traces of her, besides her ballet slippers, were ever found. Every year since, another member of the cast has gone missing after closing night: the Mouse King, an Arabian Dancer, The Dew Drop Fairy, a Flower. Eighteen-year-old Nieves Alba, who played Clara in the first ill-fated performance, is now cast as the Snow Queen. On closing night, every police officer in Boston surrounds the theater, determined to catch the perpetrator whom they’ve dubbed “The Nutcracker.” Can Nieves break the curse or will she be the next victim of America’s favorite ballet?