The Mysterious Apartment(Den hemmelighetsfulle leiligheten)

A conservative old bachelor buys an apartment previously owned by an artist who died suddenly. He has a weird feeling about the place from the start, and gets more and more obsessed by the previous owner's possessions and way of living. Finding some loveletters written by the deceased's mistress, Dott, gives him an irressistible urge to get to know her better.