Two orphans move from their native village to the house of their adoptive parents. But their hope for a happy life fades away, when they are challenged by an ancient otherworldly force.

Zero. Winter. Ural city. A high school student is beaten on the street. He is dying. Parents experience the tragedy in different ways. Mother finds the diary. Only after the death of her son does she begin to understand how he lived. The father is obsessed with revenge and is looking for killers.

About the Russian scientist Grigory Perelman, who proved the Poincare hypothesis. Mathematicians around the world have not been able to prove it for about a century, at the moment it is the only solved mathematical problem out of the seven problems of the millennium.