For four thrilling seasons, The Bookburners—a covert ops team dedicated to the recovery and containment of dangerous magical books—have battled forces of magic that have threatened to tear them and the world apart. But nothing has prepared them for the personal trials they have endured, or the scale of cataclysm they must ultimately face.

Sal's original quest to save her brother has become so much more; Father Menchú's faith has been tested . . . and transformed; Asanti has rediscovered the potential of the very thing she has helped suppress; Liam has retraced his past and charted a course for the future; and as Grace's life burns away to nothing, she has at long last found someone she is willing to die for.