Meine Schwester (2011)

Katharina Wallner is the owner of a long-established business for film videos. After the will of her disinherited landlord Heinz Ortner she should now close the lovingly run shop. So far, she was able to withstand Ortner's harassment, but the dreamy old lady is annoyed at the end. Her sister Hannah, surprisingly returning from South America, encourages Katharina to do something about the homeowner. When Ortner lies dead in the stairwell the next morning, Katharina comes over a terrible suspicion.