Mark and his dad are already drifting apart when the situation is made worse. His dad announces that they are moving a couple of hundred miles from their city home. Mark, not wanting to leave behind his best friend and familiar surroundings, tries unsuccessfully to sabotage the move. After moving into a large Victorian house in the  Northumberland countryside Mark begins to hear inexplicable tappings on his bedroom window. Do his new neighbours, and especially the attractive but slightly weird Tom, hold the key which might help Mark to unlock the secrets of the old house?