It's Thanksgiving, and the Frumps have gathered at Land's End to celebrate. But a terrible storm has hit the province, closing schools and stranding Hazel and Ned at the castle. To keep them out of trouble, someone starts a treasure hunt. At first the clues seem like harmless fun. But before long, Hazel and Ned stumble across a dusty old book of handwritten magical spells and a cache of jewels in a hidden compartment...