We return to Aldebaran, the planet where the first human colony in the solar system was founded. Mark & Kim, teenagers whose village was annihilated, have met a woman named Alexia during their escape. She is a biologist & a friend of Driss, the man who knows a lot about the catastrophe. Alexia shares Driss' secrets. The government is very interested in her & sends soldiers to pursue her. While trying to help her, Mark is arrested & languishes in prison for 3 years. It's the mysterious Mr. Pad, an odd character Mark has already met, who helps him escape from prison.