So viel nackte Zärtlichkeit (1968)

Businessman Peter Kremer returns to Bavaria after 20 years in Canada to retire in a country house. After arriving in Munich he meets Kitty, with whom he begins an affair. He even asks her to move into his mansion. Together with her brother Jochen, whose hobby is watching erotic Super 8 films, Kitty will soon be in Kremer's country house. However, Kitty's behavior seems increasingly strange and she also complains of severe pain. Is she up to a plan that Peter has no idea about?