Not only are Theo Kamp and Willem Niessen on the hunt for the Diplomat, who hails from Germany, but together with the Tilburg agency, they also have to save the EU and fight terrorism. It's chaos on the day of the attack. Theo and Willem have to pull out all the stops to get the situation under control.

With the police hot on their heels, Theo and Willem try to flee to Germany. Someone living there can help them lure The Diplomat out of hiding before he seizes power. However, the borders are closed, and a manhunt for Theo and Willem is now underway throughout Europe. Eventually, Theo and Willem find themselves face to face with The Diplomat, and it turns out their greatest enemy still has one last surprise in store.