The events of the first part take place in 1905, during the Russo-Japanese War. Erast Petrovich Fandorin works as a consultant in the capital Gendarmerie-Police Department of Railways . The main task of the brilliant detective is to develop a system to ensure the safety of communication routes, because the victory of Russia depends on it. On the day of the completion of the defeat of the Russian fleet near the island of Tsushima, a certain staff captain Vasily Alexandrovich Rybnikov, after receiving a mysterious telegram, hurriedly departs from St. Petersburg to Moscow. And near Kolpin almost falls into a crash - immediately after the passenger train on which Rybnikov rides, the Tezoimenitsky Bridge collapses . At this point, it was a letter with guns and military ... Fandorin arrives at the scene and states: the bridge is blown up . Erastus Petrovich begins an investigation and soon realizes that an elusive Japanese special agent is involved in the case ... The second part describes the events that took place in 1878 in Japan, where Fandorin holds the position of vice consul . How Erastus Petrovich met Masa, under what circumstances mastered the techniques of the ninja, how is the mysterious Vasily Rybnikov connected with ancient events? . All the answers are waiting for readers in the second volume of the eleventh part of the series “Adventures of Erastus Fandorin”