Will Ahearne's search for his true identity spans two lands; modern Ireland and its other-world counterpart, Eriu. In Eriu, his senile grandfather has a mysterious room, from which he gives Will a birthday gift which signals the end of his childhood and everything he has known. Plunged into a terrifying world of demons, witches, wild magic, and civil war, Will must deny all he knows and loves before fighting his inner and outer demons in his search for who he is.