Eddie and his friends plan to dress up as the slimy Mud Monsters--legendary spooks who supposedly live in Muddy Creek--but their plans change when they meet the real Mud Monsters.

It's springtime at Winterhouse and Elizabeth is settling into the joyful chaos of her new home. But it isn't long before she and Freddy are drawn into an ominous new mystery. Guests at the hotel start behaving oddly, and Elizabeth's powers manifest in thrilling--sometimes frightening--new ways. As unnatural tremors shake the foundations of Winterhouse, Elizabeth hears cries for help from Gracella Winters, a villain she'd thought dead and gone for...