S4, E11: Ever since the "Seeblick" golf course decided to expand its premises, there has been trouble. An anonymous protest group has set itself the goal of preventing the expansion of the sports facility at all costs. When the protesters start rioting in the clubhouse, Hubert and Staller are called in. But the property damage is immediately forgotten when the policemen find building contractor Katja Sperlinger on the golf course - fatally hit by a golf ball. The two investigators quickly rule out the possibility of a sports accident. This means that club manager van Bargen is in no doubt: the anonymous "anti-golfers" are behind the crime. When Hubert and Staller identify a slingshot as the murder weapon, this suspicion is reinforced; the protesters had used the slingshot to shoot balls onto the course in order to disrupt the games. But are the activists really capable of cold-blooded murder? Hubert and Staller decide to take a closer look at the golf club life. They are surprised to discover that there is a lot going on behind the façade of the idealic sports club, and that Katja Sperlinger also had enemies within the club. The two sergeants begin to doubt the motives of the "anti-golfers". Were the protesters merely scapegoats for the perpetrator to cleverly hide behind?