After discovering the body of an undercover police officer in the trunk of a car, the CID team blunder into a Drugs Squad operation against a major trafficker that appears to implicate one of their closest colleagues.

The team is taken to the edge of reality following the death of a participant in a magical ritual invoking a demon. Is there a supernatural cause for the murder, or is there a much more earthbound explanation?

Sunny and Jess attempt a reset as they follow the clues in the case.

As a major trial gets underway, Professor T presents the case to his students--it involves a caretaker accused of shooting dead his rich employer. It seems an open and shut case, but the Professor turns expert witness to prove otherwise.

Now released under a new name and a new identity, has the suspect from Van der Valk’s past started killing again? Or is someone else killing in her name? It’s a tale of redemption and potential second chances that is mirrored by ex-girlfriend Lena’s request for a second chance. Will Van der Valk let her back in?

Sunny and Jess’ personal lives go from bad to worse while they struggle to keep focused. Meanwhile, the suspect list grows, and a mother and son are put under the microscope.

Professor T's classes are proving popular. The material he presents is like a thriller that has the students on the edge of their seats and they start flocking to his class in increasing numbers. Annelies receives confirmation that her father's euthanasia request is legally valid and that she has been named trustee. Struggling with this heartbreaking decision, she turns to John for support.

The present-day murder of a museum employee involved in the restitution of ancient artifacts links back to a case Van der Valk worked on at the beginning of his career, alongside boss Julia Dahlman’s ex-husband. The suspect was convicted and put behind bars but has since been released.

The victim’s turbulent past comes to light. While Sunny takes a trip to Paris and Jess drops in on an unsuspecting potential suspect, the pair continue to butt heads

A physician, his wife and two children are found dead. It is unclear to the team which one of them was the killer of the other three and therefore which of them committed suicide. Professor T is having nightmares and suffering from hyperventilation; is this a result of his therapy? Annelies makes a shocking discovery about her father and Rabet receives startling news.