CIA agent Alice Racine, a skilled operative, is reassigned to London as a caseworker after failing to capture a Paris-based terrorist responsible for a deadly attack. However, her mentor suddenly calls her back into action when the CIA uncovers evidence of an impending attack, only to discover that sensitive information has been leaked.

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A CIA interrogator unwittingly triggers a deadly trap, threatening to unleash a devastating biological attack on London, putting the entire city in peril.