Wolfs and Eva, now detectives, refuse to give up and hunt down the members of the society that murdered Mechels. They discover a Belgian link and, risking their own lives, manage to steal evidence. But just when they think they can bring down the society, something completely different happens.

An attack is made on Miss Limburg. Meanwhile, Wolfs has the bottle of whiskey that probably killed Juliette and Mechels examined by the lab. Eva is kicking her habit at the clinic, but has to leave when it turns out that a journalist knows about a possibly addicted detective. The journalist appears to know a suspicious amount, and when Wolfs is accused of rape by a witness, Wolfs and Eva's position becomes untenable. Romeo and Marion discover that Carlito Hinch probably carried out the attack. But their witness is shot dead in the street.

While Wolfs investigates the murder of a drug dealer, Eva tries to find out what happened to Akua in Liège. When she finds her murdered, it hits her hard and she makes a radical decision. Meanwhile, Wolfs discovers that the murdered dealer also supplied drugs to Alkje, the victim of Belgian killer Carlito Hinch. Was he killed for drugs, or is he also a victim of the society? Journalist Juliette Bison helps Wolfs investigate the society, but it's not without a struggle.

Eva has gone into hiding in Liège, where she runs into an old acquaintance, Akua. With Romeo's help, Wolfs comes across a diary describing the gruesome, protracted murder of a woman. The diary belongs to the notorious professor Pascal Bodet, whose wife disappeared without a trace ten years ago. He claims that the diary is fiction.

Wolfs and Eva are added to an Amsterdam team that is eager to make a big drug bust in Maastricht. Wolfs doesn't trust Eva around heroin and assigns her to work on something else. He shouldn't have done that, because the arrest turns into a shootout in which one of the Amsterdam detectives is killed by a bullet from Wolfs' gun. Romeo has completed the leadership course and has developed a good relationship with the course leader.

On a country estate, the elderly lady of the house is attacked in her bed in the middle of the night. She suffers a knife wound. Initially, the family is in shock and has no idea who could have done this. But it soon becomes clear that things are not as rosy as the family would have us believe. Who has a motive to kill the old lady? Romeo and Marion are confronted with a man who comes to report a robbery. After visiting a prostitute, he was attacked by a man. When it turns out that the prostitute is still a minor, Romeo and Marion suspect the man of pimping.

The murder of a debt collector working for a housing association turns out to have far-reaching consequences. The man, a refugee from Bosnia, is not as innocent as he appears to be. While clearing cannabis plantations, Marion and Romeo are approached by a man who claims that his disabled parking space has been stolen by loitering teenagers.

A bank employee is murdered as he drives into the parking garage with his wife. After investigation, it appears that there is nothing illegal in his actions that could explain the murder. Wolfs and Eva discover that a criminal with the same car lives in the same building, so they quickly conclude that it was a case of mistaken identity. As Eva and Wolfs delve further into the criminal's life, things turn out to be not so simple. Marion teaches at school and receives an anonymous report from a child who is afraid of becoming a victim of a family tragedy. The report is anonymous. Should Marion respect that or find out who in the class made the report?

Wolfs and Eva investigate the death of a major drug dealer who is found electrocuted on a plantation. The drug dealer's entourage is also investigating his death, led by his furious widow. She wants revenge on the perpetrator. Romeo and Marion are assigned to cybercrime. A young man living alone orders items that he does not pay for.

On his way back from soccer practice, a boy is sexually abused and murdered. He has a sports sock in his throat, reminiscent of an earlier case in Drenthe. When it turns out that the victim's coach in Drenthe—who was also a suspect at the time—now lives in Maastricht, all the alarm bells go off. Marion and Romeo encounter an elderly woman who is desperately lashing out at people in a supermarket. Is she simply demented and unmanageable, or is there more to her behavior?

A girl appears to have disappeared. The entire modus operandi is reminiscent of a similar case from years ago. The perpetrator is imprisoned in a psychiatric hospital and now claims that the new disappearance proves his innocence. Romeo and Marion are confronted with a student suffering from amnesia.

A young girl falls from an apartment building. Accident, murder, or suicide? Marion, who knows the girl from the street, thinks it's murder. Wolfs thinks it was suicide; the girl was addicted to drugs. Romeo is on a leadership course. Eventually, Marion and Wolfs unravel the events, but whether they have solved the case is questionable. The suspect they arrest is immediately deported to Belgium.

A woman comes to report the kidnapping of her child by Maastricht drug dealers. It soon becomes clear that there is much more to the report than meets the eye, and that the victim and perpetrators are inseparable. Romeo and Marion are faced with a missing person case. An alcoholic woman has disappeared after being evicted from her home.