1981. The war between the two superpowers comes to around San Fierro. Several Soviet soldiers create a diversion at a secret facility of the U.S. army. The city surrounds a strange, acrid fog. The government extends martial law, and the people more radically to Express their discontent. The government has got a leak, everyone is now a suspect in connection with the Communists. Into town arrives a military detective Paul, his task is to investigate the leakage of information, in the face of incredible constraints and strong pressure from the outside.