lonesome killer
Banhammered
This game is fun and thrilling. 1 person is a spy, who has to complete a series of objectives. 1 person is a sniper, who has to find the spy. Everything the spy has to accomplish has a tell. For example, contacting the Double Agent makes a "Banana Bread" sound play that the sniper can hear. Bugging the ambassador requires you to pull your arm behind them. The sniper sits outside the map, and wherever he looks is a red laser sight so the spy can see him. You get 1 shot. If you shoot a civilian you lose.
It's in beta, and for $15 you can get access to the current and final game. There's several maps, with a few different objectives and customizable win conditions.
http://www.spyparty.com/