Richard lives apart from his wife. He is unemployed. His life is really not running smoothly right now. Rather by chance, he gets into conversation with the director of his daughter's school, who is desperately looking for teachers - which gives Richard an idea. He is a mathematician. And after all, everyone can become a teacher!

Empathy is a two-edged sword, especially for Martin. Tormented by the past, haunted by the present, the chief inspector is a brilliant investigator and, together with his team, solves the most convoluted cases. From kidnapping to hostage situations, to murder. Unable to eat or sleep until a case is solved, they all take their toll.