In the summer of 1990, fourteen-year-old Trevor Riddell gets his first glimpse of Riddell House. Built from the spoils of a massive timber fortune, the legendary family mansion is constructed of giant, whole trees, and is set on a huge estate overlooking Puget Sound. Trevor's bankrupt parents have begun a trial separation, and his father, Jones Riddell, has brought Trevor to Riddell House with a goal: To join forces with his sister, Serena, dispatch the ailing and elderly Grandpa Samuel to a nursing home, sell off the house and property for development, divide up the profits, and live happily ever after. But as Trevor explores secret stairways and hidden rooms, he discovers a spirit lingering in Riddell House, whose agenda is at odds with the family plan