On the planet Tslamaina, or Horsea, as the people who discovered it called it, there are three races. Mai, so similar to people, and so appreciative of wealth. Wise, although sometimes, by human standards, strange, tsla mountaineers, overgrown with wool. And bloodthirsty cannibal giants on.

People who arrived on the planet are attracted by the mysteries of unusual nature and geology. But they have no right to leave the capital without permission from the local government. Maev - the treasures of the semi-legendary, lost city of the dead - many tons of sunite - a precious and mysterious metal. But you can’t get there without earthly technology.

This is how this expedition began, the participants of which at the beginning were the earthling researchers, the spouses Etienne and Lyra Redoul and Mai Irkvit and Homat.