"The evening Caitlin and Olivia's parents leave them to go to a dinner party, both girls are bubbling with excitement. At ages 10 and 13, they are at last old enough to stay home alone. After all, in their idyllic town no one even bothers to lock their doors. As the summer light fades, after TV and popcorn, the sisters finally put themselves to bed. They're unaware of the figure watching them through an open window. Or of the back door opening once they've fallen asleep. When their parents return, they will find Olivia's bed empty. Their golden-haired, long-limbed, eldest daughter gone. Never to return. Until now. But is the woman who claims to be Olivia all she seems? Is everything Caitlin said she saw that night the whole truth? Their family have dreamed of this moment, but both sisters are keeping more than one secret. What price will they all pay if they end up believing the wrong daughter?"--