A night thunderstorm reveals the monster's hiding place: in a city park, right under the feet of walkers, dozens of human bodies are buried. Every day the case becomes more and more mysterious - all the victims are of different genders, ages, and most importantly, they were kidnapped in different countries long before their death. The police reach a dead end, but serial killer expert Anna Solari manages to establish the true motive of the killer. Now she knows for sure: he will not stop voluntarily, anyone can become his victim. Meanwhile, brothers Leon and Dmitry Agranovsky save a dangerous criminal, and he is ready to do anything to thank them. At first, neither brother is going to use the services of the king of the underworld. But it may turn out that soon they will have no choice...