Baroness Amalia Korff did not immediately understand why an uninvited guest had come to their house. As it turned out, Louise Delorme was trying to investigate the murder of her mother, Louise Leman, which occurred twenty years ago. At that time, Louise Leman lived with her lover, Sergei Petrovich Mokrousov, whose estate was located next to the estate of Amalia’s relatives. They still remembered this terrible story: Louise’s body was found in a ravine, her lover and his new passion were under suspicion, but they managed to get away unscathed, and one of the servants went to hard labor - obviously on false charges... Intrigued Amalia, along with Louise went to the scene of the old crime. Is it possible after so many years to find evidence, witnesses and identify the real killer? Yes, if the brilliant Baroness Korff gets down to business!