"The third pulse-pounding novel in an epic fantasy series set in the same world as the wildly popular Red Sister, following an outcast who will fight with everything she has to survive. On the harsh planet of Abeth, covered with ice except along a narrow corridor, Yaz has had to fight hard to survive, and she's made friends-and enemies-along the way. The Convent of Sweet Mercy, like the Corridor itself, is packed with peril and opportunity. Yaz needs the nuns' help-but first they want to execute her. The fate of everyone squeezed between the Corridor's vast walls, and ultimately of those laboring to survive out on ice itself, hangs from the moon. And the battle to save the moon centers on the Ark of the Missing, buried beneath the emperor's palace. Everyone wants Yaz to be the key that will open the Ark-the one the wise have sought for generations. But sometimes wanting isn't enough"-- Provided by publisher.