Fate has brought together four young people from our world into the enchanted world of Tír. Together Kate, Alan, Mark and Mo present a formidable new force for good in this war-ravaged world: they are Hope for the millions of oppressed peoples that live here.The four have been split up, with one of their number kidnapped, one lost and one changing almost beyond recognition, and it falls to Alan to unite them once again and restore their strength.But the Great Witch Olc, scheming in her Tower of Bones, is planning to lure Alan into a trap. And she has resurrected the demigod Fangorath, a dreadful force for malice, for her own evil ends.