Nutty, Naughty Chateau (1963)

Student Frederic gets himself invited to visit a Swedish family living in an isolated castle. Arriving in cold winter at a castle surrounded by snow, Frederic slowly encounters each member of the strange family: Hugo, the castle's 40-year-old master, married to Eleanore, to whom Frederic starts to feel attracted; Sebastien, Eleanore's incestuous dandy brother; Agathe, Hugo's old-fashioned sister; and Ophelie--Who is Ophelie, actually? That's one of several mysteries that Frederic tries to solve. Who is manipulating whom? Frederic's growing love for Eleanore and the truth about the gorgeous Ophelie will lead to unpredictable consequences.