 Fandorin is informed that a Turkish agent, Anwar Effendi, is conducting an intelligence operation against the Russian army and might even have penetrated Russian headquarters.This is confirmed when the telegram directing the Russian army to take Plevna is mysteriously changed to an order to take Nikopol, a strategically irrelevant town.Varvara's fiancé Pyotr, who encoded the telegram, is jailed on suspicion of treason.