Norddeich is a truly peaceful vacation spot on the North Sea coast – until a series of murders shakes the small town. For Commissioner Ann Kathrin Klaasen, who is currently in a deep life crisis, this case becomes a test that completely overturns her previous idea of good and evil. Ulf Speicher lies with a hole in his forehead in his kitchen – shot with a historical weapon. Kai Uphoff is next. His body is found between the sheep grazing peacefully on the dike. The two victims, who were killed with extreme brutality and precision, lead Commissioner Ann Kathrin Klaasen and her colleagues Weller and Rupert to the Rainbow Association, which is not only cares for disabled people, but also manages their sometimes considerable assets.
The nerves of the employees are bright. What did their boss, Ulf Speicher, and Kai, who spent his voluntary social year with them, do that they had to die? Who will believe next? Then a young boy on the way to the beach also finds the deputy head of the association – cruelly murdered. A number of investigative steps further and only when it is almost too late does Ann Kathrin suspect the full extent of unprecedented manipulation, whose fatal consequences have already cost three lives and are now directed against the next victims with devastating anger.