The continuing adventures of our Aldebaran heroes Mark and Kim are sent to Betelgeuse to look for survivors of the spacecraft crash that killed 3,000 people seven years earlier. They do find survivors, among them Tazio Menegaz and Colonel Logan, who tell them the colonisers had been divided over whether the Iums (indigenous creatures) are as intelligent as humans. If they are, the humans would have been forced to abandon their colonising enterprise according to UN laws. Kim decides to investigate for herself. This two-volume book includes “The Expedition.”

A wounded Kim has been rescued by Hector, but they are stuck inside the planet’s vast network of caves. Steve and Inge leave the expedition behind to look for them. All of them make their way through multiple, winding tunnels, trying to avoid particularly hostile and dangerous fauna in order to meet up. But the nightmare creatures aren’t the only ones down there. A strange technology reveals itself, and the Iums come and go in large flocks. Soon, an alien yet hauntingly familiar sight will put Kim on the track of Betelgeuse’s hidden secret…

In this conclusion to the second cycle, Kim, Inge, Mai Lan and Hector have been camping for weeks in the wilds of Betelgeuse’s canyons, waiting for Hector’s ankle to heal. As they get ready to head back to the settlement, unaware that Alexa and Mark have finally reached the planet and made contact with the colonists, the mantris sends Kim an invitation! What follows is an extraordinary encounter that will decide the future of Betelgeuse and change the course of Kim’s life forever.