My brother introduced this game to me a while back and I really enjoyed it. There are several variations of this Mafia-like group game but the overall gist of it remains the same. Basically, it's a game of deception, mystery, and survival between a village of people with different "powers" and several werewolves who are out to tear the town apart.
One variation of the game that seems quite nice is this one in playing card form. It would make a nice gift for Christmas and is super easy to carry around.