Yana and Margosha decide to lose weight urgently and sign up for the “Zulfia” dance school. During the classes they meet a charming girl named Milena. Suddenly Milena falls to the floor and dies… It turns out that Milena was poisoned with a rare poison used by special services. The clues pulled by the self-appointed detectives led them to the famous “House on the Embankment.” A web of intrigue and crimes, cunning and greed, family heirlooms in the “local diamond fund,” the history of an ancient noble clan of Klansky, murders, chases—and finally, the inevitability of punishment for the harm done—this is the outcome of the investigation by two tireless friends, Yana and Margosha. Read by the author.