The series tells the story of the undercover police officer Martin Hristov (Ivaylo Zahariev), who infiltrates the gang of Bulgarian mafia boss Petar 'Dzaro' Tudzharov (Mihail Bilalov).

Critic Emil Antonov said the show "offers viewers a dynamic and tense atmosphere, and interesting characters in a crime drama attractive to much of the native audience.

During the fourth season, BNT head Vera Ankova threatened to pull state funding from the show, putting the series' future in doubt.

[6] While the first episode was in production, Fox Crime began negotiations to distribute the film internationally in other Balkan nations Romania, Slovenia, Bosnia and Herzegovina, Macedonia, Croatia, Montenegro, Albania and Serbia.

[8][9] In 2012, New Films International announced plans to distribute the series in China, Germany, France, Great Britain, Turkey and throughout Latin America.