This is the game that we made at the 2nd annual Global Game Jam (Jan 29..31, 2010). The theme was Deception.
As a incorporeal assassin, you possess and control the bodies of innocents to further your mission of destroying rival assassins. It’s a networked multiplayer action game, where you attempt to deceive the other players into thinking you are just one of the masses, while trying to spot others when they slip-up.