Tells the story of Cornelia Titko, a brave scientist with remarkable memory, whose childhood was destroyed by the premature death of her parents and older sister. Cornelia's mother, Teresa Titko, was an outstanding nuclear physicist; in the Gierek nuclear program, she played the role of the right hand of its creator, general-professor Grzegorz Giedrowicz. Years later, a mysterious man appears in Cornelia's life, claiming that he was once accused of murdering her sister. The heroine begins a private investigation. Who is the mysterious man and what really connects him with the death of Cornelia's two closest women? What price will she be charged for trespassing into forbidden territories? What role in this history were played by the officers of the PRL counterintelligence - Captain Ewa Wolańska and Second Lieutenant Tadeusz Mróz? Who wanted Poland not to join the small group of countries that counted in the nuclear race?

"Later it was said that the man came from the north from the Powroznicza gate. He walked on foot, and led his horse, which was laden, by the bridle. It was late afternoon and the stalls of the ropemakers and saddlers were already closed, and the street was empty. It was warm, and the man was wearing a black cloak thrown over his shoulders. He was drawing attention." - So begins the short story "The Witcher" by Andrzej Sapkowski, which gave rise to a seven-volume series.

A policeman gets killed and the short-staffed police chief sends for a few experienced officers to support him in his fight with organized crime. Meanwhile, a conflict between local gangster groups escalates.