They say the enemy of the enemy is your friend. But sometimes it's hard to know the true enemy—and harder still to know who your true friends are. As a hunter, Constance Jaeger grew up believing that all vampires were evil. But now the Accords say they are citizens with rights. Constance is dubious. And her doubt grows when a vampire who scoffed at the Accords has murdered a neighborhood cop who looked out for the homeless, the sort of cop even the street kids trusted. She wants revenge. Her strongest ally against the rogue bloodsucker is the charming, fiddle-playing Valentine McBain. He's seeking vengeance for a beloved servant and friend killed by the same vampire. The only problem? Valentine is a vampire too. She doesn't want to trust him, but she may not have a choice. The deeper they dig into their mutual foe's machinations, the bigger the problems they uncover. Simple revenge rapidly turns into a tangled web of corruption, trafficking, and sorcery, until Constance and Valentine are the only ones who can stop the summoning of a demon powerful enough to destroy an entire city. Assuming they can work together long enough to do it.