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The schism is raging, and the world is sinking deeper into the cold and darkness of the Last Time. Essun's search has led her to a bizarre clash with old and new friends, but hasn't brought her any closer to her goal - her daughter, who has been kidnapped by her husband. Meanwhile, she is drifting further and further from her mother, and miles of ashen wasteland are not the most insurmountable obstacle separating them.

Essun faces two unasked for tasks, each more impossible than the other: to accept the thunder as her new home and to open the Obelisk Gate to end the Times once and for all. As she plumbs the depths of orogeny, the world, and her own being, she will prepare for the decisive battle of the ancient war she has found herself in the middle of.