Calvin Kinsey's just trying to have a good time...and then an injured vampire lands on his doorstep.

Cal has spent the past three months recovering from his injuries in the wake of the violent scandal that nearly tore DSI apart. Now back in Aurora after a stint in physical therapy, Cal's trying to get his life back on track, his mind back in shape, and his attitude back in check before he returns to active duty in a few weeks' time.

But when a mysterious vampire shows up half-dead at Cal's apartment, and an old rival warns him that the dangerous Black Knights are plotting a major attack against Aurora, Cal finds himself caught in the middle of an off-the-books case that has the potential to end his career—and his life.

With enemies closing in from all sides, and his DSI colleagues left in the dark, Cal has no choice but to trust his instincts, a vampire he just met, and the very man whose savage attack traumatized him forever. Because if he doesn't, Aurora will fall, and millions of innocents will fall with it.