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The year is 1972- the Cold War is far from over and Serena Frome- in her final year at Cambridge- is being groomed for MI5. Sent on Operation Sweet Tooth - a highly secret undercover mission - she meets Tom Haley- a promising young writer. First she loves his stories- then she begins to love the man. Can she maintain the fiction of her undercover life? And who is inventing whom? To answer these questions- Serena must abandon the first rule of espionage - trust no one....