Thirteen thousand years ago, there was a civilization that was more advanced than the modern one. Two incredible misfortunes befell her, one after another. First, the planet was covered by a prominence that flew out from our star. Due to the intensity of the magnetic field, all electronic equipment burned out. Then a big comet fell. It crashed into the water near Greenland and caused huge waves. The tsunami washed away Hyperborea and plunged the continent called MU into the abyss. An incredible amount of dust and gases rose into the atmosphere. In the northern part of America, Europe and Asia, glaciation began, which lasted for a thousand years. The entire population was thrown back into the Stone Age. Gleb watched how the bandits appeared, how the robberies and murders began.