On a not-at-all-pleasant morning, Daria Vasilyeva, an enthusiast of private investigation, was visited by her friend Lena Gladysheva, who accused her of secretly slipping twenty thousand dollars into the mail box. But it wasn’t Daria! Lena’s husband Oleg disappeared a year ago under mysterious circumstances. At first Lena was in dire straits, but she proudly refused help... Only everything seemed to be getting better, and—bam! Someone had sent her money allegedly in Oleg’s name. The friends decided to find out from the concierge who had put the envelope there. She said it was the mail carrier Sonya. While Dasha talked with Sonya, some thugs killed the concierge and seriously wounded Lena. The mail carrier described the man who had given her the money. It seems it was... Oleg. Could he have run away from his wife and son? Why?.. The police don’t catch mice; they consider it a mere coincidence. Well, nothing—Dashutka will straighten them out, especially Colonel Degtyarev! She’ll find Oleg—alive or dead!…