By the will of heaven, or rather, thanks to the meteorites that shot down his spaceship, a scientist from Earth, Mark Whisham, finds himself on Vankor, a planet where the Middle Ages reign and the greatest invention is a primitive flint pistol. Mark has to forget about who he is and become a free wanderer who, according to local customs, is not supposed to wear a long sword over his shoulders. However, Mark wears it. And not only wears it, but also applies it. And where to go if the cozy and civilized world of the Earth is hundreds of light years away...