The Astronaut's Forbidden Girl

Wren Kessler, a 16-year-old self-taught mechanic from the poorest sector of a ring-shaped space station, builds an illegal combat machine (Frame) and forces her way into the prestigious Junior Vanguard Trials with a Wildcard entry. But surviving the tournament means taking on the reigning champion, corporate-backed rivals determined to eliminate her, and a hidden conspiracy buried inside her own machine.