In the year 2056, Wanda Roland, 13, is accidentally put on the spaceship taking her 23-year-old brother, Glen, and his companions, Mark James and Jim Rudolf, to Mars. Glen is angry to find his sister instead of a boy, scheduled to come with them. Wanda is convinced that it is all right to go to Mars, even though her parents object because of her migraine attacks. She is determined to find water on Mars