During an illegal quest game in the Moscow metro, two of the team of diggers encounter unprecedented aggressive creatures. The creatures suck blood from people, inflict pain and move through portals. Who are they? How did you get on the subway? A team of four friends is trying to unravel the secret of terrible underground vampires and find their lair. They don’t even assume that the history of the appearance of creatures stretches from the distant past of the Earth, from the time when an alien ship fell on Earth about a thousand years ago.