Emma loves her husband, Leo, and their young daughter, Ruby. But almost everything she's told them about herself is a lie. And she just might have gotten away with it if it weren’t for her husband’s job. Leo is an obituary writer; Emma is a well-known marine biologist. When she suffers a serious illness, Leo copes by doing what he knows best --- researching and writing about his wife’s life. But as he starts to unravel the truth, he discovers that the woman he loves doesn’t really exist. Even her name isn’t real. When the very darkest moments of Emma’s past finally emerge, she must somehow prove to Leo that she really is the woman he always thought she was. But first, she must tell him about the other love of her life.

When Sarah meets Eddie, they connect instantly and fall in love. To Sarah, it seems as though her life has finally begun. And it's mutual: It's as though Eddie has been waiting for her, too. Sarah has never been so certain of anything. So when Eddie leaves for a long-booked vacation and promises to call from the airport, she has no cause to doubt him. But he doesn't call. Sarah's friends tell her to forget about him, but she can't. She knows something has happened --- there must be an explanation. Minutes, days, weeks go by as Sarah becomes increasingly worried. But then she discovers she's right. There is a reason for Eddie's disappearance, and it's the one thing they didn't share with each other: the truth.