The new thriller from the author of The Boy at the Door. What would you do to get your daughter back?Three months ago Alison's world fell apart when her five-year-old daughter drowned at the local lake. Lost in grief, her husband and friends are unable to reach her.Across town, Iselin's life is about to change. Her seven-year-old daughter has survived a life-saving operation. After years of treading water, they can now start thinking about the future.These two mothers have never met. But their daughters will bring them together. And the consequences will be devastating...