A group of scientists is sent to the planet Arkanar to help the local civilization, which is in the Medieval phase of its own history, to find the right path to progress. Their task is a difficult one: they cannot interfere violently and in no case can they kill. The scientist Rumata tries to save the local intellectuals from their punishment and cannot avoid taking a position.
A young guy from province arrives to Moscow and his life turns upside down.
The young librarian Ksenia, who until recently was solving her numerous family and financial problems, one day becomes the owner of an inheritance - a huge apartment, a bank account and a new Mercedes, and with it many secrets and mysteries. Ksenia understands that in this life nothing happens just like that... Step by step she is approaching the solution, not realizing that a threat is already hanging over her...
