Wally's uncle dies and leaves Wally an ancient castle in his will. The Kids go to Scotland to claim it. Soon weird things begin to happen such as the drawbridge going up and down by itself, the ghost of a headless woman stalking Merilee and Steffy, and a "ghost hound" lurking around them. Soon Butch realizes someone is trying to scare them out of the castle. With the help of a medallion Wally has also inherited, the Kids find out why, hidden in a secret passageway is a collection of gold and jewels! But who wants the Kids out of the castle? Who wants the gold?