Little Martin, the son of a criminal, ends up in an orphanage, where Police inspector Popov gives him a chance; Martin graduates a police school in France, before returning to Bulgaria to become an undercover cop.

Martin infiltrates the criminal organisation headed by Petar Tudjarov - Jaro, where he uses his connections and manages to get back to the mob a car full of drugs.

After stealing the car Martin has his description handed to the Organized Crime Unit; Martin receives crucial info regarding an upcoming drug deal and he and Popov start gathering proof against Jaro.

Jaro's people suspect a mole; the loyalty of Zdravko 'the Hair' is questioned; Martin starts his own investigation.

Martin warns Popov that the mobsters are setting a trap for the cops; Jaro orders Martin to eliminate a rogue dealer.

Martin joins the team in robbing the safety deposit box of a Lebanese businessman; Popov investigates a company connected to Jaro's business but his superiors order him to leave it.