Blood Bound is one of the better social-type boardgames. It has a very interesting hidden identity system similar to the Resistance and Avalon series of boardgames, where a hidden identity card determines your allegiance. Unlike Resistance, you don’t get to to know who your teammates are at all after you start, you can only see a quick look at your seatmate’s alleged allegiance at the start (though this isn’t always true — it may look like he’s part of that team but this isn’t always the case).
The result is everyone stabbing each other from the start of the match as people are trying to figure out who’s who and who’s the leader of each team. Only once the leader has been captured and revealed does the game end.
Very very nice mechanics. It’s available on Amazon here: