I Let You Go by Clare Mackintosh

A tragic accident. It all happened so quickly. She couldn't have prevented it. Could she? In a split second, Jenna Gray's world descends into a nightmare. Her only hope of moving on is to walk away from everything she knows to start afresh. Desperate to escape, Jenna moves to a remote cottage on the Welsh coast, but she is haunted by her fears, her grief and her memories of a cruel November night that changed her life forever. Slowly, Jenna begins to glimpse the potential for happiness in her future. But her past is about to catch up with her, and the consequences will be devastating ...