In regular Clue, you set three cards aside at the beginning of the game, and the players try to deduce what those three cards are by figuring out what cards are in each others' hands.
"Resistance: Avalon" is my Sunday group's go-to game. It's fast, easy, a little bit of strategy and lots of persuasion. For us (~5 or 6 players) it tends to be one-sided, and I'm pondering how to change that.
Current notion is to hybridize it with Death Clue while preserving the talky/cooperative aspects. (Don't know how. Might not be possible.)