Theo decides to go into therapy in a monastery; Tjebbo and Willem chase the second group of terrorists; in its own way, the monastery is not exactly the best place for Theo to relax.

Theo and Willem interrogate Franz Redelmacher, hoping he will identify The Diplomat; they don't know The Diplomat is in Tilburg and has been observing Theo and Willem for a long time.

Bureau Tilburg is under attack; while the terrorists are shooting their way into the building, Willem and Theo try to keep everyone safe; the attack becomes world news, making Tilburg is the center of Europe.

After the attacks, The Diplomat is about to seize power; Theo and Willem try to stop him but become the main suspects themselves; Theo and Willem become the most wanted men in Europe.

Hunted by the police, Theo and Willem try to escape to Germany to visit someone who can help them get to The Diplomat before he seizes power, but the borders are closed; eventually, Theo and Willem face The Diplomat, who has one last surprise.

Peace returns to Tilburg; Willem takes over the leadership of the police force, and Theo leads a quiet life; their tranquility is shattered by a hacker who steals information from a database of criminals.

Willem and Theo protect famous criminal Geer from an assassin who gives him only 48 hours to admit to committing a major crime; Geer claims he has never been involved.

Willem and Theo can't identify the serial killer while he orders them to expose a pharmaceutical company for killing children.

Willem and Theo must save a corrupt lawyer from the serial killer as they come face to face with him for the first time.

When Harold finds an old case that helps Willem and Theo, the serial killer makes it very personal.

The serial killer puts Willem in a tight spot by going after a childhood friend of his.