Reissued after seventy-five years out of print—and in hardcover for the first time in a generation—Lucky Starr and the Moons of Jupiter is the fifth book in the Lucky Starr series written by the legendary Isaac Asimov, author of Foundation, the Galactic Empire series, and I, Robot. The Lucky Starr series was originally published under the pseudonym Paul French.

Sabotage!!!

Agrav. It was the century’s most important advance in space travel … and an experiment so revolutionary that only the men who huddled beneath the surface of Jupiter Nine were permitted to know its full meaning.

Yet someone else did know—knew everything, saw everything, heard everything—and was diabolically sabotaging the top-secret mission.

Who or what the enemy was, Lucky Starr didn’t know. But one thing was certain: the deadly force was not human … not even remotely human!