The Isis Collar

Now she strives to maintain her sanity and her soul while juggling both vampire abilities and the powers of a Siren. Warned of a magical "bomb" at a local elementary school, Celia forces an evacuation. Oddly, the explosion seems to have no effect, puzzling both Celia and the FBI. Two weeks later, a strangely persistent bruise on Celia's leg turns out to be the first sign of a magical zombie plague. Finding the source of the plague isn't Celia's only concern. Her alcoholic mother has broken out of prison on the Sirens' island; her little sister's ghost has possessed a young girl; and one of Celia's boyfriends, a powerful mage, has disappeared.