In the ice, east of the Black Rock, there is a hole into which broken children are thrown. Yaz's people call it the Pit of the Missing and now it is drawing her in as she has always known it would. Yaz's difference tears her from the only life she's ever known and learns that Abeth is older and stranger than she had ever imagined. She learns that her weaknesses are another kind of strength and that the cruel arithmetic of survival that has always governed her people can be challenged. A new epic fantasy series set in the same world as "Red Sister."