INTERNATIONAL BESTSELLER • A NEW YORK TIMES NOTABLE BOOK • From the Booker Prize winner and bestselling author of Atonement , an “effortlessly seductive” novel ( The New York Times ) that masterfully entwines espionage and desire in an unforgettable story of intrigue, betrayal and love. One of the Best Books of the Year: San Francisco Chronicle, Seattle Times Cambridge student Serena Frome's beauty and intelligence make her the ideal recruit for MI5. The year is 1972. The Cold War is far from over. England's legendary intelligence agency is determined to manipulate the cultural conversation by funding writers whose politics align with those of the government. The operation is code named "Sweet Tooth." Serena, a compulsive reader of novels, is the perfect candidate to infiltrate the literary circle of a promising young writer named Tom Haley. At first, she loves the stories. Then she begins to love the man. How long can she conceal her undercover life? To answer that question, Serena must abandon the first rule of espionage: trust no one.