Is it true that some houses bring grief to their owners? Dasha Vasilyeva isn’t afraid of black cats, isn’t concerned about the number thirteen, loves Mondays and doesn’t believe in cursed houses. But the mansion next to her cottage is, in fact, unlucky. Its owners constantly change—and something bad happens to everyone. And now, once again, at Karina Burkina’s—yet another owner of the unfortunate house in the Moscow region—her younger son, Valery, has gone missing. The owner’s mother-in-law, Svetlana Alekseyevna, rushes to Dasha for help. Vasilyeva agrees to help the Burkins. And then it turns out that Colonel Degtyaryov has known this family for a long time, and met them under very strange circumstances: many years ago, Svetlana Alekseyevna asked Degtyaryov to help change her daughter-in-law’s surname—and even gave Kiryu’s boy his patronymic changed too! Dasha believes that these threads from the past will help in finding Valery. But now she understands how fair the proverb is: little children—little troubles; as children grow, troubles grow with them.