After years of traveling through space, a crew of humans has finally found an uninhabited world to colonize. Almost twelve-year-old twins Evie and Emery Linn decide to sneak out and explore their new home. But on the surface, Evie starts noticing troubling signs. Plants curl tightly around her finger, as if they were alive. Strange tracks lead off into a dark cavern. Evie can't help but wonder--are they truly alone on this planet?