Chairman Andreas Hausler is found during his local annual tractor old-timers club's festival preparations, skull smashed with a motor spare part, a poorly staged accident. Logical suspects include his ousted club rival, Markus Wanninger, and his bullied son Sebastian, who was against his will planning a marriage with Andreas's daughter and has suspicious wounds, fitting a fight in the fatal night during a meeting he lies about. The murder weapon also points to local garage boss Alfred Rössel.