The crew of the damaged spaceship PRIMAVERA builds an industrial plant on the planet, which is characterized by strange anomalies and has no rotation of its own, in order to be able to carry out the necessary repairs in orbit. Meanwhile they have to defend themselves against alien plants, animals and deadly microorganisms. Due to heavy physical as well as mental stress their community threatens to break up. Then an extraterrestrial civilization, far superior to humans in technical terms, appears. The fight for life begins.