The full moon killer already has two young women on his conscience. He always kills at full moon, cuts off the hair of his victims and puts it in cemeteries. But this time, the Viennese police under the direction of Alex Brandtner want to mess up his tour. When the moon is full again, the commissioner has all Viennese cemeteries monitored. The trick seems to have succeeded, because no corpse appears in any cemetery that night. But in the morning, art student Judith Geiger is found strangled at a tomb in the Vienna Woods. Crime scene tourism is booming, and Alex Brandtner breaks a sweat despite the dirty weather as he sets out to solve the third murder case. Rex and his colleagues don't have much time to solve the puzzle, because the next full moon night is sure to come.