Strange Neighbour

Ever since the peculiar and eerie neighbor Gertrude Tappendiek moved in, nothing has been the same. During the day, whimpering noises and rotten smells penetrate from her apartment, and at night, pets in the neighborhood disappear. What's happening here? What's up with the talk of occult rites and sacrifices? You want to get to the bottom of it. You know that Gertrude Tappendiek always leaves the house at the same time and returns exactly one hour later. You manage to gain access to her apartment, but suddenly the door slams shut and cannot be opened. Can you find a way out to avoid becoming a victim yourself?