One Underground girl escapes from a soldiers' raid. Lost and above ground for the very first time, she has only one option to secure her survival: the Legion - a government organization for teenagers with no place left to run. Leave your identity at the gate, and join a life of military service until you reach adulthood. It sounds ideal, but the Underground girl knows that the System won't stop looking for its female runaway. So, she tells a lie about her gender. And it will change her forever. Posing as Raja, a boy-soldier, the Underground girl is thrown into Legion life at its full, brutal speed. Here, she meets Senior Commander Briggs, whose savage authority reigns over the teenage soldiers. Amongst them are a band of oddballs known as the South Tower Rejects, led by Stirling, a tall, savvy stranger with bright copper hair and eyes that shine like oceans. There's something hiding behind his cocky smile, and Raja wants to know what it is.