Sweet Tooth by Ian McEwan

Set in the early 1970s, the novel follows Serena Frome, a young and beautiful Cambridge graduate, who is recruited by MI5. Tasked with a covert mission, she is assigned to secretly support a promising writer whose political views align with the agency's interests. As Serena becomes deeply involved in her assignment, she finds herself entangled in a web of deception and romance, leading to unforeseen consequences. The story explores themes of love, betrayal, and the blurred lines between fiction and reality, ultimately questioning the nature of truth and the moral complexities of espionage.