In this companion volume to The Boggart, the invisible and mischievous spirit living in the Scottish Castle Keep sets out to help save Nessie the Loch Ness Monster, one of its few remaining cousins.
In 1930, on the coast of Scotland, eight-year-old Kirstie finds a large egg which hatches into an unusual sea creature, and as he grows her family must decide what to do with him.
Twelve-year-old Ru reluctantly joins her parents in Scotland for the summer, where she and new friends Dax and Hammy Beans search for the Loch Ness Monster.