Craig and Linda's parents have taken them to Canada this summer—far away from "that wicked monster Nessie." Luckily, a secret passageway connects Loch Ness in Scotland and Lake Memphrémagog in Quebec. The passageway is part of a crumbling stone maze. Nessie's daughter, the Princess Sheona, has become trapped in the maze. Craig and Linda pay their last visit to Nessie's Grotto Will frightened friend, 7-year-old Angus, and his giant sister Haining get along with Nessie?