Sophie Hannah is a psychological thriller that follows Sally Thorning, a mother who has been juggling the demands of work and family. When she watches a news report about a tragic murder-suicide involving a woman named Geraldine Bretherick and her daughter, she is shocked—because she had an affair with a man claiming to be Geraldine’s husband, Mark Bretherick. As Sally digs deeper, she realizes that something about the case doesn’t add up. The police investigation uncovers disturbing secrets, and Sally becomes entangled in a mystery where her past choices put her in unexpected danger. The novel is a gripping psychological suspense story filled with twists, unreliable narratives, and a slow-burning tension that keeps readers guessing.