The Earth is crowded and food is rationed, but a colony on Ganymede, one of the moons of Jupiter, offers an escape for teenager Bill Lermer and his family. Back on Earth, the move sounded like a grand adventure, but Bill soon realizes that life on the frontier is dangerous, and in an alien world with no safety nets nature is cruelly unforgiving of even small mistakes. Bill’s new home is a world of unearthly wonders — and heartbreaking tragedy. He will have to face hardships, survive dangers, and grow up fast to meet the challenge of opening up a new world for humanity. Praise for Robert A. “If there is any single author who defines science fiction, it is Robert Heinlein . . . there is no other writer whose work has exhilarated me as often and to such an extent as Heinlein.” — Dean Koontz “One of the most influential writers in American literature.” — The New York Times Book Review “Robert Heinlein is America’s acknowledged master of science fiction.” — Chicago Tribune