From Ubisoft: On July 4, 2007, a North Korean missile base is hacked and used to launch a cruise missile against the USS Clarence E. Walsh in the Korea Strait. While U.S. Intelligence suspects that the North Koreans were not responsible for the attack, the U.S. decides to strictly defend South Korea against possible North Korean aggression. While they mass troops to defend Seoul, the Americans also send Third Echelon agent Sam Fisher to North Korea to investigate. At the same time, the Ghosts are deployed behind enemy lines to carry out sabotage, reconnaissance and quick strikes against the North Korean Army (NKA) should the conflict explode. Officially, not a single U.S. asset is in North Korea.