Perry Rhodan has discovered a huge space ship, an ark in space, carrying a population of humans who set out on their journey 55,000 years ago, from Earth - Lemurians, the legendary forefathers of mankind.

After the Akon Empire has seized the ark of the stars, Perry Rhodan has to come up with new ways to solve its mystery. A reconstruction of data found on the ark points the way to a sister ship. But Perry Rhodan is too late: That ark has crashed on a planet. Among the survivors, Perry Rhodan finds an unlikely passenger ...