Lieutenant Colonel of the anti-terrorist unit Vadim Veklemishev, the legendary Viking, has disappeared. His fighting friends are looking for him, but to no avail... And the invincible Great Dragon appeared in the decagonal fighting ring, easily crushing all rivals. A man with no name and no past. He doesn't remember who he was before. Complete loss of memory after injury. Now his life is continuous fights. People who have established the “fighting business” are not averse to doing other shady things. The Dragon learns about their plans to organize a grandiose terrorist attack. By this he dooms himself to death, death in the fiercest battle. And indeed, in this battle the Dragon was gone. A Viking appeared instead. And he knows how to win a fight. Even without rules...