Connor Grey, a druid consultant for the Boston P.D., usually helps the cops solve their “strange” cases, but now he’s the suspect in the midst of one. Wrongly accused of a terrorist act that rocked the city to its core, Connor evades arrest by going underground, where rumors of war are roiling. A final confrontation between the Celtic and Teutonic fey looks inevitable—with Boston as the battlefield.

Undercover agents are turning up dead in the Weird—their murders brushed aside and ignored—and Connor exposes a citywide conspiracy of silence that seems linked to the inexorable march to war. As he digs deeper into the mysterious deaths, Connor draws closer to the secrets of a past he has sought for so long. And as friends and allies abandon him one by one, Connor discovers that in the clash between light and dark, and in the face of a cataclysm of epic proportions, he might have to make the ultimate sacrifice to save the world.