The Intruder's Access to the Apartment

A prowler could be going around the boarding house and possibly looking into this apartment. It actually doesn't even sound like they use the window. I think they use the door. And my point in showing you this photo is that there's no security here. Anybody could have walked in. The police believe that the intruder came in through the front door, went down, accessed the apartment,. And then went out the back.