"White sport" boasts a halo of prestige, in leisure time it is enjoyed mainly by rich and successful people. However, all nobility is put aside when a cruel teammate named murder enters the court, as happened in a Viennese tennis club. In the dressing room, they discovered the corpse of a young player with a knife in his back. Shortly afterwards, the head of the hall dies in the same way, and another member of the club narrowly escapes death. What unites the victims of murderous attacks?