Golden couple Annie and David Crayce have it all. A loving marriage, three beautiful children and a thriving family business. Life couldn't be better. Until the unthinkable happens? A perfect crime? A piece of damning DNA evidence has arisen, placing David as the prime suspect of a murder committed twenty-years ago. Annie is sure her David is innocent. But if he isn't guilty, then either his father or brother must be. As the police investigate the cold case, so does Annie. Trawling through her old diaries, she begins desperately looking for answers. But it all comes down to a few lost hours she can't solve. And Annie begins to doubt the one person she thought she knew best? Her husband.