Pawel Zawadzki is hired to go undercover in an elite high school in Poland, when three students mysteriously disappear.

People pay their respects to the victims of the massacre at the school and Pawel pays a visit to Karol in the hospital.

Pawel and Marta are desperate to be together, despite the fact that she is in danger. Meanwhile, Agata takes Karol home and starts to ask questions about rehearsals.

Pawel helps Ewelina get back on her feet and she agrees to help him in return by infiltrating the school; she will work as a waitress in the school cafeteria and use the name Wera.

Pawel tries to explain the situation with Ewelina to Marta, and Ewelina moves out to a youth hostel after the fight.

Radek, Borys, and Krzysztof inspect the scene of Ewelina's murder and Pawel cannot forgive Radek for his failure to protect her.

During a police interrogation Pawel discovers that Tymek is missing. He also deduces what the missing piece of Iwo's plan was.

The police determine the identity of the boy found on the beach. The investigation is led by Assistant Commissioner Ewa Krawiec. The teacher begins to suspect that the Captain is hiding something from him.

A recording appears on the Internet which shows that Kacper most likely committed suicide. Meanwhile, the newspaper publishes an article accusing the Captain of violence against students.

Belfer finds a recording in the Captain's house that casts suspicion on Krynicki.

Belfer suspects that Kacper was the Captain's son. The tailor and Drużbacki find traces of blood in the warehouses. One of the employees confesses to the murder.

Kacper gives Belfer a recording of Ivan's murder.

Belfer gives the police the recording of Ivan's death. Kacper decides to confront his father.

Butryś kidnaps one of the students. However, thanks to Belfr, he manages to rescue him. Belfer finds out who is behind the Captain's death.

Maciej remains in hospital, near death, watched by Ewelina and his father Jacek. Pawel makes a tempting offer to Sebastian, and the prosecutor asks for DNA samples from suspects.

The body of high school student Joanna Walewska is discovered by three of her peers. Police initially believe that she may have committed suicide, but they soon find out there is more to the incident.

Police begin to interview students, under the supervision of their principal. They are joined by a psychologist, as they learn more about who Joanna really was.

Joanna's mother opens up, which helps to clear one of the suspects of foul play. This leaves Pawel in a compromising position, as he was convinced of the suspect's guilt.

During a cruise for high school graduates organized by Belfr and his father, called the Captain, one of the students, Kacper Krynicki, disappears. Shortly afterwards, the police find the boy's body on the beach.

The mood in the town grows sombre as the investigation begins in earnest, and disrupts some illegal activities. The police begin to suspect the local high school sports teacher, Daniel Poreba.

Pawel continues with his own investigation, with the help of local reporter Lechak, who is providing access to documents. The details of the contraband liquor trade are determined, so the plan can go ahead.

Marta realises that the deed of sale for the property is partly fraudulent after examining it more closely. The police discover that some of the DNA samples were tampered with.

The criminal brigade are forced to rally and take action after an impressive escape. Pawel is convinced that Adrian is innocent, and calls on his colleagues to help question him.

Lieutenant Kedzierski is alarmed by the surgical precision conducted in another recent murder. He realises he needs Pawel's help, and asks him to formally aid the police.

Youlka becomes heavily implicated in the murder of Joanna, due to a damning video. However, Pawel finds that things are not as simple as they seem, when he is called to interview Youlka himself.