A folk fantasy, a spiritual allegory, a gripping journey-epic, a philosophical meditation, a poetical adventure story: and all built on a framework of the Celtic tree-calendar. Set in a mythical, pre-industrial time and place, the book tells the story of a great journey undertaken by Kip, a young blacksmith, when he is chosen to take a strange and powerful artefact ('the 13 Moons') back to its rightful place in order to restore a balance of forces to the world. He is chased by dark powers in the guise of a shapeshifter, and, as a result of his enemy's ever-changing appearances, can never be certain whether he is in the company of friend or foe. The story builds to a beautiful and unusual climax, as Kip discovers that, along the way, he has made profound self-discoveries, and that all has not been as it appeared.