The history of Central Asia, Russia and Western Europe of the XII-XIII centuries entered as the time of the invasion of the Tatar-Mongol horde - a skillful, well-organized army led by experienced commanders. This era, which changed the fate of peoples inhabiting vast spaces from Korea to the impregnable Alps, is dedicated to the trilogy of the outstanding Russian writer V. G. Yan (1874-1954). The first novel "Genghis Khan" tells about the invasion of Central Asia by the legendary commander, uniting under his command disparate Mongolian tribes. The novel "Batu" tells about the campaigns of the grandson of Genghis Khan in Russia. The action of the final book of the trilogy "To the Last Sea" takes readers to the 40s of the XII century, when the horde's invasion of France and Italy became a real danger.