Ten-year-old Leo's future and the fate of the extraordinary Whippet Hotel, where his father is the maintenance man, are at stake when a series of cryptic boxes leads Leo to hidden floors, strange puzzles, and unexpected alliances.

Travis and his sister, Corey, can't resist a good trick. When they learn that their grandmother's quiet Vermont inn, where they're spending the summer, has a history of ghost sightings, they decide to do a little haunting of their own. Before long, their supernatural pranks have tourists flocking to Fox Hill Inn,and business booms. But Travis and Corey soon find out that theirs aren't the only ghosts at Fox Hill. Their thoughtless games have awakened...