Sonja Kljun is a young, ambitious detective, eager to prove that her refined intuition is right - the alleged suicide in peaceful Subotica hides far more serious secrets than it seems at first glance. Sonja's moving to Subotica will trigger an avalanche of events that will reveal deeply buried secrets related to the mysterious organization, but also to Sonja's past. Refined intuition is not unique to Sonja, but also to her ten-year-old daughter, whose unusual dreams related to her mother's job are beginning to come true.

After a horrible massacre in a village where twelve people lost their lives, the killer shoots himself in the head, but with a strange combination of circumstances, he still remains alive. Petar, a BIA operative, is trying to figure out what actually happened because the killer, before he shot himself, uttered the word "katabaza", the same one that his late son said before he committed suicide. The psychologist Natasha helps him in that, who, unlike Petra, rationalizes the whole case, and does not think that there is anything mysterious in it.

The plot of the series follows the harmonious history of Serbia at the turn of the 19th and 20th centuries (from the accession to the throne of King Milan Obrenovic in 1882 to his abdication in 1889), from the point of view of Tanasije K. Abadzic, the king's aide, who found himself in that position through no fault of his own. Tanasije K. Abadzic is a junior military official at Obrenovic's court and the great-grandson of Crni Gruja.