Seventeen-year-old Maeve Barnes is poised on the brink of freedom-from her city, her past, and her unruly magic. Mere weeks from now, she will be on a plane bound for London and well on her way to starting a nice, ordinary life for herself.

But luck has never been on Maeve's side. A beautiful stranger appears with a dire warning: the Shadow King is coming. All Maeve's carefully laid plans for her future are put on hold when the shadowy demon crashes through the wards of the city, attacking her family and churning long-buried secrets to the surface.

In the days that follow, three things become abundantly clear. One, the Elder Council is useless. Two, Hanna-the caustic and evasive stranger-knows more than she is letting on. And three, someone inside Leto is colluding with the Shadow King to bring death and destruction within the city walls.

Amidst a flurry of unlikely alliances, near misses and heartbreaking realizations, Maeve must come to terms with her magic, her resentment toward Leto, and the possibility that she won't make it to London, after all.