He's going to a place he's never been before: home.

Moon 2 is a space station that orbits approximately 250 miles above Earth. It travels 17,500 miles an hour, making one full orbit every ninety minutes. It's also the only home that fifteen-year-old Leo and two other teens have ever known.

Born and raised on Moon 2, Leo and the twins, Orion and Libra, are finally old enough and strong enough to endure the dangerous trip to Earth. They've been "parented" by teams of astronauts since birth and have run countless drills to ready themselves for every conceivable difficulty they might face on the flight.

But has anything really prepared them for life on terra firma? Because while the planet may be home to billions of people, living there is more treacherous than Leo and his friends could ever have imagined, and their very survival will mean defying impossible odds.