The brilliant scientist, head of the laboratory for the study of genetic engineering problems, professor of medicine Marukhin, was killed. In the victim's throat they found a lump of red clay and a piece of paper with the image of a mysterious sign. Everything points to the ancient legend of the Golem - a clay man who killed his creator. Investigator Smirnov, who is assigned to the case, suspects that there will be more victims. Very soon his fears are justified: the corpses of a monk and an obstetrician are found. The investigator understands that all traces lead to the laboratory...