Josh

In the center of Luster towers an enormous tree that is the Heart of the World. Now the tree is wounded, pierced by a tunnel that connects it to Earth. Through that tunnel strides Beloved, the ancient enemy of the unicorns, followed by an army of Hunters eager to destroy every last unicorn. At the center of this great struggle is the human girl, Cara Diana Hunter, who sets out with her friend, the gryphon Medafil, to ask a dragon to aid the unicorns.

Luster, the world where the unicorns fled to escape the Hunters who have sworn to wipe them out, has dangers of its own - as Cara discovers when she attempts to cross that world in a desperate effort to rescue her grandmother. Each stage of Cara's journey brings new peril, wondrous new characters, and new clues to the mystery of her grandmother's past. And through it all threads the haunting melody of the "Song of the Wanderer."

On a snowy night, Cara and her grandmother are pursued into St. Christopher's church by an unknown man. Clutching her grandmother's mysterious amulet, and following the old woman's instructions, Cara escapes their pursuer and falls into Luster, the world of the unicorns.