The divorced police officer Nick Tschiller (Til Schweiger) has previously worked as an undercover investigator at the LKA in Frankfurt and a member of a SEK. In order to look after his 15-year-old daughter Lenny (Luna Schweiger) more intensively, he moves to the pubescent girl in Hamburg because his ex-wife Isabella (Stefanie Stappenbeck) wants to devote more time to her own career again. During his first assignment for the Hamburg LKA, the idiosyncratic investigator and his colleague Yalcin Gümer (Fahri Yardim) stab a wasp's nest during a routine home inspection. The apartment turns out to be a hiding place for underage prostitutes whose pimps are suddenly at the door.
A brutal shootout ensues, in which three members of the dreaded Astan clan are killed, with which the Hamburg police have apparently made a kind of neighborhood peace deal. The newcomer is thus immediately targeted by their own ranks. He has to face an internal investigation and justify himself to prosecutor Hanna Lennerz (Edita Malovcic), who is investigating him. Did Nick actually kill in self-defense? What did his former VE partner Max Brenner (Mark Waschke) have to do at the crime scene and what kind of strange game is Brenner's girlfriend Sandra (Marvie Hörbiger) playing? Tschiller is observed with great distrust by his new colleagues, above all by his superior Holger Petretti (Tim Wilde) and his colleague Ines Kallwey (Britta Hammelstein).
Only Yalcin Gümer, who was taken to the hospital with a gunshot wound, supports his new partner from the hospital bed. Tschiller hides Tereza (Nicole Mercedes Müller), one of the young forced prostitutes, in Yalcin's apartment on his own initiative, as he fears that corrupt colleagues could deliver her to the knife. At the same time, he hopes that she will put him on the trail of the human traffickers and his former partner, Brenner. But apparently there really is a leak somewhere, because the gangsters always manage to track down the young girl. Single-handedly, Nick takes up the fight against the pimp clan, who apparently have the Hamburg neighborhood firmly under control with bribes, fear and violence.
Firat Astan (Erdal Yildiz), head of the human trafficking mafia, is in custody on suspicion of tax fraud and money laundering. But the power of the clan, which the Hamburg authorities are allowing, is unbroken - the witnesses of the public prosecutor's office are dropping like flies for inexplicable reasons. When Yalcin finally finds out Brenner's whereabouts, Nick seems to be taking a big step forward. He has no idea that he himself has long since been targeted by the clan...