Fans of James Dashner's Maze Runner series will love this postapocalyptic adventure about a girl who must survive an alien planet in order to save the Earth.   Ana only knows her name because of the tag she finds pinned to her jumpsuit. Waking in the featureless compartment of a rocket ship, she opens the hatch to discover that she has landed on a barren alien world. Instructions in her pocket tell her to observe and to survive, no doubt with help from the wicked-looking knives she carries on her belt. But to what purpose?   Meeting up with three other teens--one boy seems strangely familiar--Ana treks across the inhospitable landscape, occasionally encountering odd twists of light that carry glimpses of people back on Earth. They're working on some sort of problem, and the situation is critical. What is the connection between Ana's mission on this planet and the crisis back on Earth, and how is she supposed to figure out the answer when she can't remember anything?