Curd Jürgens erzählt... S01 E11 ... a story from the "Hotel Sacher"

An extraordinary encounter takes place at the Vienna Hotel Sacher: a woman hired her daughter as a kind of private detective to spy on her second husband during his amusements in Salzburg. However, the fact that the observed stepdaughter has never seen the stepdaughter who has returned from America leads to an unforeseen development: the young girl has fallen in love with her own stepfather. What now?