The Third Wife by Lisa Jewell
London 2011: In the early hours of a summer morning, a young woman is killed by a bus. A tragic accident? Or suicide? A year later, her devastated husband, Adrian Wolfe, is determined to find out. Adrian and Maya had only recently married, and he'd always believed they were happy together. His children from his two previous marriages loved her. And Maya loved them. She had a job she enjoyed, she had plenty of friends, and she and Adrian were trying for a baby. They seemed to have the perfect life. Why then might she have wanted to kill herself? When Adrian finds a hidden stash of poisonous emails on Maya's laptop he begins to identify the dark cracks in her life. Because everyone has secrets. And secrets have consequences. Some of which can be devastating.