The fatal streak of bad luck in Dasha Vasilyeva's family began after a weekend they all spent at their acquaintances the Vereshchagins' horse farm. There was also another respectable couple there — Lena and Misha Kayurov, owners of two horses. True, six months earlier, when Dasha met the Kayurovs, they had been simply penniless. And Lena, who had then thrown a rag doll from the window onto Dasha's car, had been completely insane. Now she seemed perfectly healthy… Then Darya overheard a quarrel between the Kayurovs, and later Lena was found dead in the stall of her horse Lord. Vereshchagina does not believe that Lord could have killed his owner and asks Dasha to find the murderer. The amateur private sleuth, of course, took up the case. And then such things began! Everything in her family is going to pieces…