By the will of heaven, but rather, because of meteorites, having lost his spaceship Earth scientist Mark Uishem is at Vankor - a planet where there is the Middle Ages and the greatest invention is a primitive silicon gun. We have to forget about Mark, who he was, and to become a free wanderer, who, according to local customs, are not supposed to wear a long sword on his shoulders.

However, it is Mark. Not only it is but applies. And what to do if such a cozy and all the civilized world of the Earth was hundreds of light-years ...