Lucky Starr and Bigman Jones journey to the remote moons of Jupiter to find the spy who is leaking the vital secrets of the hyperatomic engines of a prototype spaceship to the enemy Sirians
Meet David "Lucky" Starr- the youngest man ever to become a member of Earth's council of Science, a dauntless detective in the face of a hostile universe.
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Jeff Wells purchases a used robot named Norby to help him improve his grades at the Space Academy, but learns that Norby was constructed by a genius using parts from an alien spacecraft and has unexpected powers