Fifteen-year-old Iga dies under the wheels of a car, and the investigation into her case is to be discontinued. When her friend Joanna Bator finds out about this, she is convinced that the girl's killer was a member of the sect in which they both grew up. The woman knows that Iga was mortally afraid of someone from the Karkonosze Settlement. Joanna returns to the Children of the Day of the Apocalypse to solve the mystery of her friend's death together with the recently met commissioner, Tymon Hanter.
—G