(From the publisher):
Jupiter—where no man could live—but where men had strange allies... and stranger enemies!
Ganymede—where human settlers lay helpless under the guns of a spaceship captained by a madman!
Earth—freed from a planet-wide tyranny, but faced with total destruction from space!
Original title: Three Worlds to Conquer
Genre: Fiction→ Science Fiction→ Adventure→ Planetary Exploration and Colonization