Now, as he begins his final year at the magical school, his place is less certain than ever. With one unique exception, he is estranged from most of his friends. A furtive darkness still hounds him. And the greatest challenge he will ever face is right around the corner.

In this monumental conclusion to the Magisterium series, bestselling authors Holly Black and Cassandra Clare push Callum to the brink of annihilation, showing how magic has the ability to both save and doom, create and destroy.