USSR, 50s. In one of the remote villages of Mordovia, local residents are seized with horror at the mere mention of the Gromov surname. At first glance, nothing unusual. The Gromovs are an average Soviet family, but not for those who know them closely enough. What frightens people so much that they seek salvation in the person of the local priest Fr. Vasily? The strange antics of Baba Nastya or the forced secrecy of her daughter Nina? Or maybe it's about a silent boy named Sasha? All the secrets will become clear when the wooden coffin lid is brought to the door of the Gromovs’ house.