An old music teacher from our time enters the body of Grand Duke Pyotr Nikolaevich, an hour before the assassination attempt on Alexander II, March 1, 1881. The attempt was prevented and the history of Russia took a different path. There will be no emperors Alexander III and Nicholas II in our history, there will be no Tsushima, there will be no First World War, and there will be no October Revolution. There will be other wars and revolutions, including scientific and technical.