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.

Capitani comes under scrutiny for a long-ago mistake, while a hidden letter, a secret phone and a distressed father help to blow the case wide open.

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.

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.

Capitani searches for clues near the crime scene, and Elsa hatches a plan to retrieve evidence from Jenny's school — and slips away for an appointment.

Capitani feels the clock ticking on his investigation, prompting him to share confidences with Elsa, who rashly follows a lead on the missing soldiers.

Capitani and Elsa pursue two promising suspects, Tanja's friends grow concerned about her behavior and Mick pushes for details on the investigation.

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 enlists local police officer Elsa Ley to help him investigate how a 15-year-old girl ended up dead in the forest surrounding her village.

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.

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.

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.

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.