In Part Three of this Minecraft adventure series, Steve and Alex have reluctantly agreed to accompany Alex's father, the Warlock of Warlock's Keep, to the annual Monsters Ball hosted by Count Griswold, a sinister vampire. Steve and Alex learn about strange things happening in the ghostly castle at night and decide to slip away from the ball to investigate the gloomy and ominous underground passages of the castle. But they are in for a shock when not only are they pursued by a hideous hunchbacked creature, but they also accidentally discover another strange and terrifying creature imprisoned in the deepest dungeons of the castle. Later, they hide in an old and strange-looking cupboard at the end of a passageway. For the moment, they're safe... or are they?