After a tragic accident Perry Rhodan discovers a huge space ship, two miles long and traveling almost at the speed of light. The ship turns out to be an ark, carrying a population of humans who set out on their journey 55,000 years ago, from Earth - Lemurians, the legendary forefathers of mankind. But Rhodan is not the only one to have noticed the ark. A ship of the Akons, Earth's arch enemies, has also set its sights on this galactic mystery ...