Elderly teacher Anna Skomorokhova comes to interrogator Knyazev. She is sure that fourteen years ago her student Gleb Ilyin, together with his friend Sugrobov, killed her son. Ilyin was the son of the mayor, and then this matter was hushed up. Now Gleb is making his way into politics, and Sugrobov has disappeared without a trace. But the woman was forced to contact the authorities right now by the unexpected appearance of another character in that old story...