The best of the best secret specialists of the Time Agency are on alert. On the planet Yilail, a Russian expedition into the past disappears without a trace. Political differences recede into the background - it is important to find the missing and find out the reasons for the disappearance. The search is complicated not only by the intricate structure of the ancient Yilail civilization, where intelligent beings completely different from each other coexist under the same sky, but earthly rescuers again encounter the “baldheads” - a cruel tribe of humanoids whose goal is to conquer the Universe.