The balance between the four Londons is collapsing. As dark magic spreads across the Maresh Empire, the fragile equilibrium that has kept the worlds apart begins to shatter. Kell, one of the last Antari magicians, struggles with conflicting loyalties, while the daring thief Lila Bard must learn to master her growing magical abilities before they consume her. Together with old allies and new enemies, they face an ancient threat capable of destroying everything they know.