Neill, Chloe. Chicagoland vampires novel.

"At the tender age of twenty-seven, Merit became a sword-wielding vampire. Since then, she's become the protector of her House, watched Chicago nearly burn to the ground, and seen her Master fall and rise. Now she'll see her mettle--and her metal--tested like never before. It starts when two Rogues vanish without a trace. Someone is targeting Chicago's vampires, and anyone could be next. With their House in peril, Merit and her Master, centuries-old Ethan Sullivan, must race to stop the disappearances. But as they untangle a web of secret alliances and ancient evils, they realize their foe is more familiar, and more powerful, than they could have ever imagined"--