One not-at-all-pleasant morning, Dasha Vasilyeva, who runs a private detective business, receives a visit from her friend Lena Gladysheva. Lena accuses Dasha of secretly slipping twenty thousand dollars into her mailbox. But it wasn’t Dasha! Lena’s husband Oleg disappeared a year earlier under mysterious circumstances. At first Lena was in need, but she proudly refused help...
Then everything started to settle down— and, suddenly, someone dropped the money on her, supposedly in Oleg’s name. The friends decided to find out from the building concierge who had planted the envelope. She said it was the mail carrier, Sonya. While Dasha was talking with Sonya, some thugs killed the concierge and gravely wounded Lena. The mail carrier described the man who gave her the money. It looks like it was... Oleg. Did he run away from his wife and son? Why?
The police “don’t catch mice”—they consider what happened a simple coincidence. Well, nothing! Dasha will wipe the floor with them all, especially Colonel Dzegtyarev! She will find Oleg—alive or dead!..