Birds of Prophecy — Thomas K. Carpenter

Katerina Dashkova must die.

When Warden Simon Snyder seeks Kat's help to solve a bloodless murder, she becomes entangled with a prophecy that predicts her death on the Winter Solstice. The investigation turns an old friend into a dangerous enemy, complicates loyalties, and creates a mystery so deep that Kat will have to expose herself to ultimate betrayal to solve it. Even if she does, the question remains: Can she save Philadelphia from an ancient evil?