Back to Mars! At long last - after four years of interplanetary study on Earth - Nelson Parr stepped aboard the Mars-bound space liner that was to carry him to his home planet. By the year 2120, Earth had established a colony on Mars and had explored the land - originally inhabited by Martians, a weird yet intelligent people...a vanished race. But when Nelse discovered the trhee-fingered handprint in his cabin, he couldn't help but wonder whether the intruder might have been Martian. Could it be that the Martians still lived?
The teen-ager reached Mars to hear disheartening news - the inhabitants of the red planet were ordered to return to Earth. But Nelse, his father and four other scientists disobeyed. They rocketed to Phobos, a satellite of Mars, where they set up their equipment to observe phenomena of the red planet...unaware that they, too, were being observed! When, through the telescope, they sighted strange events, it was decided that Nelse and a companion should take up a post on the other satellite, Deimos.
"Crash-landing" into a realm of space-tense adventure, Nelse - his companion murdered by outer-world beings - came to grips with the mysterious forces of space, alone. Capture, escape and capture follow one another in a dizzying spiral of desperate events to this book's hair-raising climax.