In the final book, Essun travels to the other side of the world to catch the moon, hoping to end the apocalyptic seasons and create a safe future for her daughter. Meanwhile, a deeply traumatized Nassun plans to use the magical obelisks to crash the moon into the earth, believing that completely destroying the cruel world is the only way to end everyone's suffering. When mother and daughter finally meet, Essun sacrifices herself to save Nassun, inspiring her daughter to change her mind, save the planet, and finally fix the broken earth.