From #1 New York Times bestselling author Brandon Sanderson comes the final book in an epic series about a girl who will travel beyond the stars to save the world she loves from destruction. Spensa managed to escape from the Nowhere, but what she saw in space has changed her forever. She faced the Delvers and finally got answers about her strange Cytonic abilities. However, the Superiority did not stop their struggle for galactic domination while she was away. Spensa's team, Skyward Flight, was able to hold Winzik at bay, while gathering allies to aid their cause, but it is only a matter of time before humanity—and the rest of the galaxy—falls. Their defeat will require all the knowledge Spensa gathered while in the Nowhere. But being Cytonic is more complicated than she could ever have imagined. Now, Spensa must ask herself: how far is she willing to go for victory if it means losing herself—and her friends—in the process. The final book in the Skyward series will either liberate humanity or see it fall forever.