The Shilov brothers discover superpowers after meeting a vampire. Seryoga and Lyokha learn that in the city building of the research institute there is a portal between the worlds of people and evil spirits, which periodically drops in to visit. Werewolves, witches, mermaids and other "tourists" from the Dark World are looked after by employees of the secret organization "Border of Worlds" under the leadership of Pavel Nikitich: the "brain of the team" Lyudmila Nikolaevna, her daughter Sveta, the spectacular vampire Ilona. The Shilovs become part of an unusual team, with which they will not only have to monitor the diligent behavior of the "dark ones", but also collect fragments of a powerful artifact.
