This political thriller offers an action-packed look at the methods and tactics of the famed British anti-terrorist squad, the Special Air Service (SAS). When a band of desperate terrorists takes over the American ambassador's home in London, their violence sets into motion a chain of events that could lead to nuclear war. However, there is an undercover SAS agent working within their ranks, and he is called upon to use the sum of his skills and abilities to safely defuse the situation and save the lives of the high-ranking hostages inside.