This is an exciting documentary detective-investigation based on the scientific works of brilliant doctors of the early twentieth century. Many of these doctors treated Vladimir Ilyich Lenin day after day and saw the whole picture of the disease, which quickly turned the genius of political improvisation into a complete ruin, and then killed him. An illness, the consequences of which had catastrophic consequences for the Soviet Union. For a long time, a picture of suffering and the death of the leader of the proletarian revolution was replaced with a syrupy propaganda picture. The chairman of the gerontology section of the Moscow Institute of IP at Moscow State University, director of the ANO Scientific Medical Center, geriatrician Valery Novoselov was the first medical researcher to gain full access to the diary kept by Lenin’s attending physicians. From this document, specialists became clear about the clinical picture of the illness of “patient Ulyanov.”