Skyward (Brandon Sanderson)

When a long-term attack against her world by the alien Krell escalates, Spensa's dream of becoming a pilot may come true, despite her deceased father being labeled a deserter.

Fighter pilot Spensa Nightshade has been embroiled in an alien empire's war and now, to figure out what she really is, she must leave her world behind to enter the Nowhere, a mysterious realm from which those who enter rarely ever return.