Well, we came home today and found numerous things in our flat moved around and a crumpled napkin on the windowsill that my flatmate and I have never seen before in our lives. Upon closer inspection, we found that our bedrooms looked as if they have been poked around in, and it's pretty obvious that someone has been snooping in our flat. We called the police, who told us to let them know if anything has been missing. We haven't finished checking yet, but so far we haven't found anything missing, just disturbed.
We need to get out of here.