In the second book about the adventures of fourteen-year-old cadet of the Space Academy Jeff Wells and his friend Norby's confusing robot, included two fantastic stories by the famous American writer Isaac Asimov "Norby and the Lost Princess" and "Norby and the Invaders" Created in collaboration with his wife Janet . Jeff Wells, a cadet at the Space Academy, is now fourteen years old. However, sometimes he feels much older: too often he has to solve the problems arising from the mistakes of the robot traveler Norby and his older brother Fargo, a secret agent, with his irrepressible craving for adventure. Here's the challenge again: finding people missing from Earth during the Ice Age. Once again, the spacecraft “Promising” goes beyond the solar system ..