Book excerpt: From the New York Times bestselling author of Before I Go to Sleep, a sensational new psychological thriller about a woman with a secret identity that threatens to destroy her. How well can you really know another person? How far would you go to find the truth about someone you love? When Julia learns that her sister has been violently murdered, she must uncover why. But Julia's quest quickly evolves into an alluring exploration of own darkest sensual desires. Becoming involved with a dangerous stranger online, she's losing herself . . . losing control . . . perhaps losing everything. Her search for answers will jeopardize her marriage, her family, and her life. A tense and unrelenting novel that explores the secret lives people lead—and the dark places in which they can find themselves—Second Life is a masterwork of suspense from the acclaimed S. J. Watson.