A lonely old woman, Alevtina Ivanovna Vorobyova, died in one of the Moscow communal apartments. The compassionate Vasilisa took upon herself all the troubles associated with the funeral. They would have buried the old woman and forgotten, but in the last moments she told everyone the secret about the jewelry that she had kept since revolutionary times. The neighbors immediately decided that the treasures acquired by Alevtina Ivanovna were stored here, in their apartment. All important matters faded into the background. And really, what could be more urgent than the search for ancient diamonds?