Some Desperate Glory

All her life, Kyr has trained for the day she can avenge the destruction of planet Earth. Raised on Gaea Station alongside the last scraps of humanity, she is one of the best warriors of her generation, the sword of a dead planet.

Then Command assigns her brother to certain death and relegates her to the nursery to bear sons, and she knows she must take humanity's revenge into her own hands. Alongside her brother's brilliant but seditious friend and a lonely, captive alien, Kyr must escape from everything she's ever known. If she succeeds, she will find a universe far more complicated than she was taught and far more wondrous than she could ever have imagined