Four years after the events in Manscheid, Luc Capitani is working as a handyman in the station district of Luxembourg City. Until Bianca, a prostitute, hires him to investigate the disappearance of her friend Andrea. The search is cut short when Capitani locates her body in a forest, and the hunt for her killer begins. Meanwhile, Lucky Onu arrives in Luxembourg from Nigeria, to look for his sister.

Capitani is hired by Valentina Draga to look after her "girls". Lucky locates his sister, who wants nothing to do with him. Police officer Elsa Ley is monitoring drug traffic in the area, but the relationship between her and Luc has deteriorated. A second prostitute is murdered in the night.

Capitani reveals he is working as an undercover police officer for Pascale Cojocaru, which enabled him to walk free from prison. Luc and Elsa share information on the murders. Bianca informs Luc of underage prostitutes working at a cabaret club in the city. Lucky struggles to get hold of his sister.

Gibbes Koenig joins forces with Valentina to combat a Nigerian drug gang. Luc tries to organise a coup, but needs Elsa's help, but Elsa calls him a crook and refuses to work with him. Luc's relationship with his boss Cojocaru starts to collapse.

Capitani helps Lucky view the body of his sister in return for information on the drug operations around Luxembourg City station. Toni is mistrustful of Luc and forbids Bianca from spending time with him, but agrees to accompany Luc on a trip to the forest to meet with a dealer.

Luc discovers his former lover Carla Pereira is supplying the Nigerians with drugs. She asks him to leave her alone. Elsa and Toni spend the night together but try to continue working together. Luc seeks assistance from his sister Jeanne, but the siblings' relationship has been rocky since the death of their father. Pascale Cojocaru realises that something is hindering Luc's release.

Capitani organises an attack on a Nigerian mafia drug shipment. Cojucaru promises Luc his freedom if the operation is successful and if Arthur is taken into custody. Luc forces Carla to participate in the attack. Lucky asks Bianca for help finding Grace. Elsa suspects that Luc is working undercover.

Arthur is found dead, while the drug shipment has disappeared. Lucky is imprisoned by Queen as he represents a risk to the operation. Valentina forces Gibbes to withdraw from the business. Cojucaru is unsuccessful in securing Luc's full release, although he has earned her trust. Luc decides to work for Valentina.

Elsa and Luc suspect that Carla is behind the drug shipment's disappearance. Protesting her innocence, Carla reveals significant information about drug dealings at the "Grand Huit" café, which Luc passes on to Elsa. Grace tells Bianca that Dominik tried to kill her. Bianca demands an explanation from Dominik.

Valentina takes over Gibbes' business, and thanks Luc for sorting the problem with the Nigerian dealer. Elsa observes that the drug traffic is continuing to operate. Bianca wonders where her former friends are getting their cash flow from. An injured Lucky seeks to return to the city. Luc and Elsa talk for the first time.

Cojocaru locates Luc's service weapon in Manscheid lake and returns it to him. Luc must confront his inner turmoil. Elsa and Toni monitor the prostitutes at the station, but Toni seems to have other plans in mind. Luc takes Lucky in, and Bianca finds Grace's address.

Luc discovers that Dominik stole the drug shipment and has been selling them via the prostitutes. Valentina defends her son and insists that Luc stays on her side. Lucky visits his sister. Bianca and Luc investigate the threats made to Lucky, and set a trap to catch Dominik and Toni.