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