
On Jupiter's moon Ganymede, an alien life-form has taken over the body of a human astronaut, creating an almost perfect copy. But perfect enough to escape discovery on the long return trip to Earth? Can the deadly counterfeit be detected and stopped before its hunger for new life can endanger an entire planet?
Earth is no more, destroyed by nuclear war; but itinerant handyman Bert Foster, wandering the canals of Mars, is possessed by a restlessness for a home which no longer exists. Perhaps the isolated outpost on Venus retains something which could satisfy this hunger; or has the madness which shattered a world merely settled in a new location?
On Jupiter's moon Ganymede, an alien life-form has taken over the body of a human astronaut, creating an almost perfect copy. But perfect enough to escape discovery on the long return trip to Earth? Can the deadly counterfeit be detected and stopped before its hunger for new life can endanger an entire planet?