Tom Clancy's Splinter Cell

Tom Clancy's Splinter Cell (also known as just Splinter Cell) is a popular stealth-action spy game that has spawned several sequels.

The Story
The Republic of Georgia's president has been assassinated, and Kombayn Nikoladze has seized power. The NSA is suspicious of Nikoladze, so they send two of their agents to spy on him - agents Blaustein and Madison. They disappear mysteriously a few months later.

The NSA's newest branch, Third Echelon, sends Sam Fisher to investigate what happened.