The first Splinter Cell on the Xbox 360 and it's great.
This is very different than the previous 3 games. You start out working for NSA just like the last game for the training mission but then you have to go undercover but not too much undercover. You have to do work for a terrorist group called John Brown's Army but at the same time you have to do work for NSA. Throughout the game you will have a trust bar one for NSA the other for JBA in every mission objectives for NSA and JBA are present you can take whichever side you wish but if you completely lose trust with either side it's game over and you have to start from beginning. There are a lot of big choices in the game that will reflect the bar more than others but nonetheless you decide which that's what I really like about the game that it's kind of like an RPG you choose the story. Of course with different choices comes different endings there is a good ending which you get if you go with NSA, a neutral ending if you keep the bars close together (which is hard to accomplish) and a bad ending if you go with JBA. The multiplayer is really fun you get to be spies or mercenaries if you're a spy you have to hack the terminals and if you're a mercenary you have to kill the spies and it's very fun you can also play co-op and use NPC's which is also nice.
Overall Splinter Cell Double Agent shouldn't be missed by any fans of action games or anyone that's a fan of the Splinter Cell series.