Princess Luna's little sister,Glimmer, a navy blue alicorn filly with a short, sky blue mane and a cutie mark of a 5 pointed star within a circle, and Namira, king sombra's little sister and long time freind of princess glimmer, a midnight black alicorn filly with a midnight purple mane and tail, with red eyes and slit pupils, a cutie mark of a red gemstone in the shape of a heart, are invited to a masquerade dinner party in an old castle with princesses Luna and cadence, derpy hooves, and queen chrysalis. But legend tells of the old castle being haunted by a ghost killer. But, it's just a legend, right?