Where wood is chopped

Anton Gerg, the head of the famous carpentry and woodcarving school in Berchtesgaden, is found murdered in the school's lumberyard. A first trace leads to Marc Bleyer, a former student of Gerg's who was recently kicked out of his design class. When it turns out that he is having an affair with Gerg's wife Sabrina, the detectives suspect a murder plot. But then it turns out that the highly acclaimed designer put his students under massive pressure and passed off their ideas as his own. Is this the key to solving the case?