The specially trained agent Martin has been appointed to the most dangerous mission in Bulgaria - to go undercover in the gang of the mafia boss Dzharo.
On his way, he has to encounter a lot of challenges in order to completely become part of the criminal world. His task becomes more complicated when he meets the big boss's girl, Sunny.
While undercover, he gets a promotion in the mafia hierarchy and becomes part of a world full of crime, violence, and corruption.

"Undercover" is a modern crime series that realistically depicts the reality of the underground world in Bulgaria.
It is a fictional series and is not related to any real persons. However, the plot contains a number of real events happening in modern life that cover the pages of newspapers and magazines-gangster wars, drug market redistribution, forgery, gunshots in the city center, corruption schemes, bank robberies, etc.