Cry_Wolf has a staff of up and comers like Lindy Booth (Dawn of the Dead) and Jared Padalecki (WB series "Supernatural") and Jon Bon Jovi (who plays a journalism teacher). When a new kid joins the private school, a group of misfits decide that their regular game has gotten too predictable. Usually, the group gets together and tries to root out the wolf, a sleeper who tries to get the rest of the group voted out. But when the group decides to start playing a new game, things get out of control. One by one, the teenagers drop dead in exactly a manner that they described in a mass e-mail they sent out to the entire school.
Like I said above, Cry_Wolf has some interesting parts to it. In the end, several twists become apparent, some of which I found to be pretty predictable, but overall it was a good experience.
Unlike movies like Sixth Sense that left clues for you throughout the movie (and thus beg for a re-watch) -- the turns that this film throws out there aren't really hinted at until the plot-twist is revealed.
In short, if you are in the mood for a good thriller with a few twists in it, then Cry_Wolf is definitely worth a rental. The only reason why I wouldn't suggest actually buying this movie is because there isn't really a reason to watch it a second time. Even though there are four or five twists at the end, they are done in such a way that going back and watching the movie a second time will give you no more insight than the explanations given.