A magical adventure. . . . Should win the hearts of a new generation. -- Kirkus Reviews (starred review) When a Stone Age man demands a talisman that will harden his heart and give him ultimate power, the tribe's magic man reluctantly creates the Flint Heart. Thousands of years later, the sinister talisman reemerges, corrupting a kindly farmer, an innocent fairy creature, and a familial badger. Can Charles and his sister Unity,...