Colin, Spike and Melissa suddenly find their lives turned upside down. Their friend and mentor, Grandfather Thunder, is gone, replaced by their merciless aunt Grizzelda. Transplanted to Horwood House, a Victorian mansion that has family history and secrets, their personal abilities begin to reveal themselves. The ghost of Sergeant Peary, killed in the war and tied to the House, becomes Colin's guardian spirit. In a series of misadventures, Colin, Spike and Melissa and their new friend Rhea, uncover a plot by Zuhayer Bombast Horwood, Colin's Great Grandfather to return from the dead. It's a family plot that has a price, Grizzelda's sanity and Colin's life.