The script focuses on the work of police officers from the special Organized Crime Unit (OCU). This starts off as an experiment, but quickly becomes a regular unit of the Wroclaw Police Headquarters targeting mafias, especially those from the post-Soviet countries. One mafia boss, Sergey, wages a ruthless war against OCU. The officers and their families face constant danger. Sergey dies, but it does not solve their problems. Other dangerous players, like Little Odessa, headed by the Russian dignitary Kola, enter the fray. Kidnappings, blackmails and killings are the name of the game.