Agnieszka investigates a girl's death in Opole, where all evidence points to ritual murder; at the time, Piotr was teaching religious studies there.

Agnieszka comes across a similar murder from months prior; Ewa becomes an easy target for Piotr, who still watches her every move.

Exhausted Agnieszka has a theory about the perpetrator of the crimes and is convinced that he has already begun his search for the next victim.

Ewa is found dying in the forest, where the panicked perpetrator left the body and did not finish the ritual.

Agnieszka finds a clue looking through older cases; with her daughter, she also finds a personal picture matching the serial killer victim profile.

As Monika begins to understand what really happened, Agnieszka worries about Jola's safety and decides to find out the truth about her childhood.