After a family tragedy, Olesya and her daughter Vasilisa go to the Potok health resort complex. Finding herself in despair, she hopes to find peace of mind and return to normal life. Together with other parents and their children, Olesya will have to undergo mysterious practices prepared for them by the owner of the complex, Spiritual Mentor Katerina. The guests of the "Stream" have no idea what tests are in store for them on the path to inner freedom. Over time, Vasilisa understands: everything around is not what it seems at first glance. They are all about to reach Zero...