Since discovering a hidden world existed parallel to our own, fifteen-year-old Grayle Rowen learned he’s also a Hexhunter, someone born with the skills to track down and kill witches. Awkward - since his friend, Sarah Finn, is a witch-for-hire. Now, together with Sarah and her elf Caretaker, Grayle travels to Istanbul to retrieve a third runestone linked to the whereabouts of the Eye of Odin - an artifact of unimaginable power. Their search pits them against Romans, a Crusader hit squad, and a journey through a deadly tomb. But what Grayle and Sarah discover about themselves along the way might be more than what they bargained for, and may ultimately put their friendship to the test.