Diana's computer was the only computer connected to the CCTV camera inside their apartment, and she only knew how to access it. There was a password to get into the CCTV section, Simon hacked the whole system using his not so great technology ideas but somehow he managed it. There were lots of files to start with, it loaded from the beginning of when they moved inside the apartment together and Simon couldn't figure out which was the best file to start with.
It took him the whole fifteen hours of returning back to New York, and yet there was nothing. The file containing the video with an audio wasn't there — but somehow I found it on my doorway when I came back from my morning run. There was a brown envelope outside my door, at first I looked from side to side just to be sure that I wasn't being watched. Then I picked it up and tore it apart, a black flash disk fell down. "What the —" I was shocked.