One night after training, 14-year-old Rastko, an exemplary student and athlete, disappears in the blocks of New Belgrade. Milica, Rastko's twin sister, furious with her parents and an uninterested police force, decides to find her brother herself.
With the help of her best friend Bogdan and Darko, a young aspiring dealer, Milica learns from a local eccentric that Rastko is in Block 27. But that block doesn't exist. In the construction of New Belgrade, number 27 was skipped. Milica, Bogdan, and Darko are slowly unraveling a supernatural mystery that dates back 50 years, to the time when New Belgrade was being built.
At the same time, Inspector Sonja Nikolić, who grew up in the blocks, is recalling memories from her own past. Mysterious passages, cellars, and atomic shelters that hide the entrance to a space beyond space—Block 27.
