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After a Paris operation fails on her watch, Central Intelligence Agency interrogation officer Alice Racine works undercover at a community centre in London. The area is known for Islamic extremism, and she passes on intel to the security services, including MI5 Intelligence Chief Emily Knowles. Racine's former station chief and mentor Eric Lasch tells her she should not feel guilty for the Paris deaths and needs to get back into the field. The CIA and MI5 learn that radical imam Yazid Khaleel plans a biological attack on an American target on British soil in collaboration with American-born Islamic convert David Mercer. Frank Sutter, an officer from the CIA's London Station, tells her she has orders from Europe Division Chief Bob Hunter to help them interrogate and break Khaleel's captured courier, Lateef.