The game starts with a very short video in which a woman on a cell phone talks about a six-year-old case. This is followed up with the instructions to go to Funcom's website, click on the background, and type in "33" to start the ARG. Just... be prepared for anything if you do. We don't want to spoil it, so we'll leave it at that and encourage you to watch the video after the jump.
[Thanks to Kaitlyn for the tip!]