Need to find murder mystery

This is most likely a made for TV movie. It takes place probably sometime after the early 2000s. It is a reunion of friends at a vacation home of some sort. One of them is really introverted and on the computer all the time. Someone dies and someone sends the computer girl a link to a game or something with riddles that ends up being the killer. I don't remember much else, and I have tried all kinds of keyword searches on IMDb. Thanks