In the seventh book of the Molly of Mars series:
In the exciting conclusion to the Pirra's World trilogy, Molly's success at the Sephian prison wasn't a win to her. Undaunted, she journeys across Sephia Prime with Vicky and Pirra. No matter the fear. No matter the cost. No matter what it takes, she will complete her most important mission. Anything short would mean death, or worse, torture her for the rest of her life.
For ages 10+.
Check out www.mollyofmars.com and the all the books in the Molly of Mars series:
Molly of Mars and the Alien Syndicate
Molly of Mars and the Alien Nebula
Molly of Mars and her Alien Sister
Molly of Mars and the Alien Creatures
Molly of Mars in Pirra's World: Alien Spacegates
Molly of Mars in Pirra's World: Alien Cages
Molly of Mars in Pirra's World: Alien Revolt
Or try my other teen+ series, Lunara.
Click on any of the links above to see more books like this one.