About the book: year / The adventure continues, Tessa, Calder and Ash set off to find a way to heal Tessa's mother. Warlock Lord Queshir of Blackgrove, after listening to them, takes Calder hostage and demands that Tessa and Ash bring him Gravenwood, a magical wooden tablet kept by the ruling Fairlace family, now led by Tessa's uncle, Mace Eldred, and his wife, Odelia Catwick. . But our heroes don’t know how they will steal it. No one has yet been able to do this, although many desire the power of Gravenwood, which can make its owner invincible.