When a British government undercover agent is assassinated, a radical anti-nuclear group is held responsible. SAS agent Skellen (Lewis Collins) is called upon to infiltrate the group and put an end put an end to their terrotrist activities. He is welcomed into the group by its fanatical leader Frankie Leith (Judy Davis) and gets closer to uncovering her plan to attack a major political target. The group raids the American embassy and Skellen, from within the residence, must use all of his skill and courage to support and guide his SAS colleagues to save the lives of the high-ranking hostages being held captive.