The police still have no idea where Tonja, Eva's informant, is, and Chief Inspector Mechels gets into a heated argument with the public prosecutor about the investigation methods. Eva continues to deny any involvement in the murder of Daan de Vos, but the evidence against her is mounting. Then Tonja's boyfriend demands that Eva remain involved in the investigation and she is allowed to leave prison for a short period under special conditions. Meanwhile, Wolfs has started his own investigation to prove that Eva is not guilty of the murder of Daan de Vos. It leads him to the leader of the motorcycle gang. The story eventually takes an unexpected turn that puts everyone in danger and leads to a climax from which they do not emerge unscathed.

A robbery at a store leads to angry reactions from the other shopkeepers. They beat one of the robbers into a coma. The other robber manages to escape. While the police hunt him down, the shopkeepers take the law into their own hands and go after him themselves. Eva feels extremely guilty now that it seems that Tonja, her informant, has fallen into the hands of the criminal motorcycle gang because of Daan de Vos. To her anger, Mechels removes her from the investigation and she finds it difficult to concentrate on her regular detective work. Then suddenly the national police are on the doorstep and Wolfs and Eva are arrested. Daan de Vos turns out to have been murdered and the question is whether they both have a watertight alibi. Wolfs is quickly released, but Eva cannot explain why a print from her boot was found near the crime scene. Wolfs, of course, is not going to let it go and comes up with his own plan.

A barber shop is brutally robbed. The perpetrator escaped through the back door, but left his balaclava and overalls behind. DNA from the perpetrator is found on them. It turns out that the robber has been wanted for fifteen years for a previous robbery that caused quite a stir at the time. Wolfs and Eva finally have the chance to catch the perpetrator of both robberies. While Marion and Romeo try to find a van that was parked behind the shop at the time of the robbery and which the robber presumably used to leave, Wolfs and Eva focus on the most important witness, a woman who came out of the toilet and was the only one to see the perpetrator without a balaclava. But she is reluctant to tell her story. As Eva and Wolfs slowly begin to understand how the case fits together, Eva receives a call on the emergency number. This means that her informant Tonja is in serious trouble. Eva immediately goes to the agreed location and makes a very unpleasant discovery.

Maastricht is shaken by the disappearance of a nine-year-old girl near a busy shopping center. An Amber Alert is immediately issued and the entire police force is mobilized to find the perpetrator. Romeo, still enthusiastically volunteering in a group that helps sex offenders reintegrate into society, fears that the man he is responsible for has something to do with it. But Wolfs and Eva discover that the clues lead to someone else entirely. Meanwhile, Romeo is plagued by guilt. Eva tries in vain to get Tonja and her boyfriend to testify about a crime they witnessed within the motorcycle club. And Wolfs learns that the threat from Daan de Vos is much worse than he first thought.

A wealthy retired businessman is found beaten to death in bed by his youngest daughter. The murder leads Eva and Wolfs into a world where people will do anything for appearances and will stop at nothing to achieve beauty. Romeo and Marion also encounter beauty when a graffiti artist treats the citizens of Maastricht to unsolicited works of art in unusual places. Marion sees the appeal, but Romeo and Mechels are not impressed.

When an elderly woman opens the door to her storage room in the apartment building where she lives, she dies in a huge explosion. The woman is killed instantly. When Eva and Wolfs investigate, it turns out she is not the only death in the apartment building. Several residents appear to have died in the days before under very suspicious circumstances. A sinister serial killer seems to be at work, and the team finds itself in a race against time to try to prevent more victims. Marion has been given time off for a family member's funeral. It turns out very differently than expected, and before she knows it, she is caught up in a family feud. While Romeo gets to know a sex offender he is helping to reintegrate into society, Wolfs finally has time to go on a motorcycle tour with his friends. However, his friends turn out to have an appointment with another motorcycle club.

A doctor reports a colleague to the authorities. At the insistence of the desperate parents, he allegedly performed euthanasia on a few-months-old baby without following the correct protocols. But the doctor in question denies performing euthanasia. Wolfs and Eva have to find out what really happened, which paints a very different picture. Romeo and Marion also have to deal with strict rules when they accompany a bailiff during a seizure. However, the victim has no intention of giving up without a fight. Tonja, a former colleague of Eva's late husband, contacts her. She knows more about the criminal activities of a motorcycle club and may be willing to work as an informant. But only if Eva runs her. Then Daan de Vos also shows up at the police station. He has come to report an assault.

A high-ranking EU official is accused of rape by a chambermaid. The man denies the allegations and claims that he is being used. It is up to Wolfs and Eva to find out what really happened. This is no easy task, because nothing is what it seems and evidence is hard to come by. At the same time, Wolfs and Eva are trying to get to the bottom of a criminal motorcycle club that is very interested in Wolfs' touring club. Romeo, Esmee, and Marion also encounter violence against women. And there, too, the case turns out to be not as easy as first thought. Daan de Vos has gone from harassment to making threats. Wolfs can just about tolerate that, but when his daughter Fleur becomes a target, all hell breaks loose.

Eva and Wolfs try to make the best of it as ‘ordinary' police officers on the street. When they are confronted with the murder of a young hairdresser and her father threatens to take revenge on the perpetrators, Mechels and her team have to pull out all the stops to prevent that from happening. However, the threat comes from a completely different angle. Risking their own lives, Wolfs and Eva end up at a school, and the big question is whether disaster can still be averted. And then there is Daan de Vos, who has turned harassing Eva and Wolfs into an art form. Romeo has decided to get to know the COSA circle, a group of volunteers who assist sex offenders in their return to society.

Because they unlawfully arrested Daan de Vos, Eva and Wolfs are reassigned. They are no longer detectives and must now patrol the streets in plainclothes. There, they encounter the murder of a young cocaine dealer and a new detective team. Meanwhile, Daan de Vos comes to Mechels to get his story straight and demands that Wolfs and Eva no longer have contact with him. But what if Daan himself doesn't stick to that... Marion tries to persuade Romeo to join a COSA circle, a group of volunteers who support sex offenders in their return to society. However, Romeo is not sure if he wants to do that.