Cold Curses by Chloe Neill

It's all magical hands on deck for vampire Elisa Sullivan and her allies as they fight to save the Windy City from a supernatural onslaught, in the newest installment of the USA Today bestselling Heirs of Chicagoland series.
Elisa, the only vampire ever born, is hoping all can remain quiet in the City of Chicago in the wake of a destructive attack by an ancient demon who broke the city's defensive magic. Still, she and her friends, including shifter Connor Keene, know they need to be ready for anything.

Everyone is working as hard as they can to repair the city's wards, but unwelcome creatures are slipping through and Elisa soon finds herself caught in the middle of a magical turf war with roots that go back generations. She knows she will have to take a stand, but retaliating threatens to reveal her deepest secret...