Colonel Ryazantsev was restless: his subordinate and part-time fiancée, Eva Ershova, seemed to be in trouble. She was given a job as a research assistant at the Research Institute of New Biotechnologies, where, according to rumors, something very suspicious was going on. And lately, Eva’s reports have become somewhat strange... What is happening at this institute, where Professor Utiugov, a luminary of genetic engineering, is conducting dangerous experiments? Compared to him, even the famous Doctor Moreau seems like a half-educated amateur! Perhaps it's time to help Eve out before she is turned into a frog princess or something worse...