“People will die.” Locked doors are opening, and uncanny creatures are tumbling through mysterious portals from Mag Mell, the world-between-worlds, into the streets of Chicago. The Dark Man has marked Aiden with a new song that’s scared him badly, and a frightening new group of sídhe is lurking nearby. Teagan knows this is war, and she must protect her family. She leaves her flesh and bones behind to join Finn in hunting the evil beings across the city. Meanwhile, their relationship is heating up—almost faster than they can control. But he is still bound to fight goblins his entire life . . . and by blood she is one of them now. Then the gateway to Mag Mell cracks open again, and the Wylltsons find themselves caught in a trap. As her loved ones begin to die, Teagan realizes that she must destroy the Dark Man and his minions once and for all in order to save those who remain . . . . . . before it is too late.