Cytonic

Spensa has already done more than most pilots ever will. Fighting for the Defiant Defense Force, she became one of the best starfighter pilots among the humans trapped on the planet Detritus, and she helped break the hold of the Krell, the alien species that had kept her people imprisoned for decades. She then left home as an undercover spy, slipping into the Superiority and seeing for the first time how large the galaxy is beyond her barren world. That galaxy is now at war. The Superiority, the alliance that wants to rule all human life, has begun a campaign across the stars, and Spensa has seen what it plans to use: the Delvers, ancient and mysterious alien forces able to destroy whole planetary systems in an instant. No number of DDF pilots can stand against something like that. Spensa, though, is Cytonic. When she faced a Delver, something about it felt strangely familiar, and she suspects that understanding her own nature may be the key to stopping it. The only way to find out is to abandon everything she knows and enter the Nowhere, a place few travelers ever come back from. Cytonic is the third book in Brandon Sanderson's Skyward series. It takes its heroine far from the cockpit and into the unknown, where courage means walking straight toward what frightens her most.