The secret agent of the Russian Emperor, Baroness Amalia Korf, together with her partner, Sergei Lomov, was awaiting an order to go on a new matter of national importance. The partners spent time in fencing training and mental sparring. After going to visit his old acquaintance, Basil Istrin, Lomov, laughing skeptically, told Amalia that the day before two young people, Arseny Istrin and Olga Levasheva, had the same dream. Amalia ridiculed this story, but soon the dream exactly came true - the corpse of Lisa, Olga’s sister, was discovered. Now Amalia, a cynic and a realist, became seriously interested in this case and independently took up the investigation...