Design by Marty Smith
It seems like every time international affairs are tidied up by Sam Fisher, the U.S. government's one-man intelligence bureau, someone comes along to mess things up again. In Chaos Theory, the main thrust of the story is that someone is using the incredible power of the Masse kernels (algorithms that allow their users to hack into almost any computer system, no matter how secure) in an attempt to start a war in Asia. Given Sam Fisher's intimate familiarity with the power of the Masse algorithms, he's sent into the area to find out who's behind the rising tide of war, and to shut them down for good.
As with the earlier games in the series, Chaos Theory pits Fisher against large numbers of enemies, but doesn't ask him to rip through them all with an automatic weapon; the emphasis here is on stealth, secrecy, and plausible deniability - you're given the freedom to kill as needed to complete your objectives, but in most cases, it's best to just avoid enemies or knock them out to avoid unnecessary complications. Should you decide to get in on the stealthy kill action, though, Chaos Theory is much more forgiving than earlier games in the series; Sam now carries a knife which can be used for nearly instant lethal kills at close range, and leaving massive numbers of corpses in your wake will no longer automatically trip alarms later in the mission, so long as you take precautions to hide them from roving guards.
GameSpot's Game Guide to Splinter Cell: Chaos Theory offers up a complete walkthrough for the game, complete with tips on how best to lure guards off of their patrols, how to get high success ratings after each mission, where to find all of the opportunity objectives in the missions, and tips for the game's multiplayer modes.