In the mountains of the Kingdom of Gotan, there are areas that the locals avoid. Those who dare to violate the ban disappear without a trace; Recently, a group of scientists disappeared in one of the protected areas. The inhabitants of the kingdom carefully keep the secret and do not tell anyone the legend about the three demons guarding the Gates of Hell that arise in the jungle. However, the earth is full of rumors, and year after year desperate daredevils strive to penetrate the Gate. Some are attracted by the thirst for treasure, others by the desire to know the secrets of This and That Light, and still others by the desire to master the forces of Evil and become a demon themselves. Participants of an international scientific expedition who decided to explore the mysteries of the “Gotan Triangle”, by the will of fate, find themselves in the center of terrible and mysterious events...