Emperor Postumus has grown up. He will soon be twenty years old. According to the law, the dictator Benit must resign and return power to the emperor.

But the dictator does not care about the law...

Meanwhile, in the east, Genghis Khan is again gathering his armies on a campaign. What can Benit oppose to the huge, superbly armed army of Genghis Khan? A few measly legions? But he can send the young emperor into battle so that he will die along with the army... No one can save Rome from defeat. Unless the almighty gods...