As civil war sweeps across the Shima Imperium, the Lotus Guild unleashes their deadliest creation - a mechanical goliath, intended to unite the shattered Empire under a yoke of fear. Yukiko and Buruu are forced to take leadership of the rebellion, gathering new allies and old friends. But the ghosts of Buruu's past stand between them and the army they need, and Kin's betrayal has destroyed all trust among their allies.

The Shima Imperium verges on the brink of environmental collapse; an island nation once rich in tradition and myth, now decimated by clockwork industrialization and the machine-worshipers of the Lotus Guild. The skies are red as blood, the land is choked with toxic pollution, and the great spirit animals that once roamed its wilds have departed forever.

My name is Alice Long, and I've always known I was different. When I was little I used to climb up to the highest branches of the housetree at night, and watch the starships docking at the orbital stations high above. Forty meters off the ground, watching ships 30,000 kilometers overhead, with senses that could pick out radar pings and comm chatter as easily as the ships themselves. It all seemed perfectly natural at the time.

They came against her as a child. Now they face the woman. The ice is advancing, the Corridor narrowing, and the empire is under siege from the Scithrowl in the east and the Durns in the west. Everywhere, the emperor’s armies are in retreat. Nona faces the final challenges that must be overcome if she is to become a full sister in the order of her choice. But it seems unlikely that Nona and her friends will have time to earn a nun’s habit before war is on their doorstep.

The second novel in the brilliant new series from the best-selling author of Prince of Thorns. In Mystic Class, Nona Grey begins to learn the secrets of the universe. But so often even the deepest truths just make our choices harder. Before she leaves the Convent of Sweet Mercy, Nona must choose her path and take the red of a Martial Sister, the grey of a Sister of Discretion, the blue of a Mystic Sister or the simple black of a Bride of the Ancestor and a life of prayer and service.