"I have held you at night for ten years and I didn't even know your name. We have a child together. A dog, a house. Who are you? Emma loves her husband Leo and their young daughter Ruby: she'd do anything for them. But almost everything she's told them about herself is a lie. And she might just have got away with it, if it weren't for her husband's job. Leo is an obituary writer; Emma a well-known marine biologist. When she suffers a serious illness,...