Police officer Bela (Olga Bołądź) is struggling with criminal cases in her hometown. One day she comes up with the idea of catching all the wanted local criminals at once. In the meantime, the war between the Mokotow mafia and the Zoliborz group for influence in Warsaw is intensifying.
When the Internal Security Agency makes Bela (Olga Bołądź) an offer she can’t refuse, the policewoman goes through a specialist training by the FBI and becomes an operator in the S Department, as an officer working under cover. A gangster from the Mokotow group - Zywy (Piotr Stramowski) – takes revenge for the death of his friend on his own.
Following a court ruling, Zywy (Piotr Stramowski) is set free. Along with Cien (Sebastian Fabijański) and Milimetr (Tomasz Oświeciński), they decide to celebrate in a club, where Bela (Olga Bołądź) wants to confront the gangsters for the first time. Padrino (Bogusław Linda), the concerned boss of the Mokotow group, gives orders to follow her daughter’s new boyfriend.
Zywy (Piotr Stramowski) disappears after the robbery of the Wolka Kossowska Bank, and Cieniu (Sebastian Fabijański) with Milimetr (Tomasz Oświeciński) are locked in jail. Cieniu’s wife, Anka (Katarzyna Warnke) is left destitute. Nanny Daria (Agnieszka Dygant) tries to help her. The women get the idea to start pushing drugs.
Anka (Katarzyna Warnke) and the nanny (Agnieszka Dygant) figure out a plan how to get to Copenhagen with the drugs. Upon their return, the nanny offers Padrino (Bogusław Linda) cooperation. In the meantime, the mafia boss has more and more problems with his daughter Futro (Julia Wieniawa). Bela (Olga Bołądź) tries to take advantage of this.
Bela (Olga Bołądź) is sacked. She decides to unmask her boss’s plot. The nanny (Agnieszka Dygant) decides to retrieve the business taken over by the Zoliborz mafia. Zywy (Piotr Stramowski) is suffering more and more from being a state’s evidence and living a life in hiding.
Anna and Justyna are adapting to living in a new environment. Daria takes a risky step, involving Colombian woman, Aida.
Anna gets good news, but she still has to deal with the new reality. Justyna is becoming increasingly involved in the ideology of Islam.
Aida is taking refuge from gangster Mata. His daughter, Stella, isn't thrilled about it. Meanwhile, Justyna makes a brave decision.
Daria is working with her former rival to find out who betrayed them both. Anna opens a new club, and Justyna learns about the tragedy and decides to act.
There are black clouds over Stella and Aida's emotional life. Daria, planning her revenge, unexpectedly bumps into an old friend.
Daria gets everything to pay off her debt. Stella and Justyna secretly work out a revenge plan.
