Guardian of the Castle
The team investigate a number of fatalities that have been caused by poisoning. Daan is back in the office but his relationship with Annelies is under strain. Professor T's replacement is struggling.
When a fire breaks out at a student residence, it turns out to be a case of arson. Professor T's therapist challenges him to ride on a bus, but he is more concerned about his university replacement.
The mysterious deaths of a physician, his wife and children leave the team perplexed. Annelies makes a shocking discovery about her father. Rabet's son-in-law wants to take his granddaughter to India.
A series of attacks are carried out on SUVs. Professor T invites Christina Flamant to his home for dinner as a therapy assignment, but it doesn't go smoothly. Daan's replacement John joins the team.
Shocked by Van der Weyden's poor teaching, Professor T embarks on a mission to bring him down. Annelies has some tough decisions to make about her father's care. Rabet vanishes with his granddaughter.
Annelies and John have a tough case to crack when a jeweller's family is taken hostage. Flamant has assumed Rabet's responsibilities, but she has problems of her own after separating from her husband.
Jitske, a 17-year-old girl with Down's syndrome, claims that she knows who murdered her mother, but she doesn't want to say who it is. Professor T fears that Flamant is making advances towards him.
A woman's body is found 100 metres from where her car fell into a deep canal, but the team are puzzled when they realise her injuries were not caused by the accident. Professor T's ego takes a blow.
Professor T refuses to address the annual conference of criminologists because he has only been given a slot as second speaker. But then the headliner is murdered, throwing the event into disarray.
Professor T is outraged when his therapist implies that his feelings for Christina Flamant may run deeper than he admits. Struggling with a heart-breaking decision, Annelies turns to John for support.
When a student at a strict Catholic boarding school is found dead in her room, the team investigate. Annelies lays her father to rest. Rabet is back from his trip and soon rubs John up the wrong way.
An undercover agent who infiltrated the local drugs scene is found dead in the boot of his car. The target of the subsequent investigation is drug lord Mark Desmedt, but is he too obvious a suspect?
While the team is closing in on drug lord Mark Desmedt, John discovers that Rabet and Serge are working together with the criminal. Professor T asks Annelies to assist him with some vital research.