About the book, from the author's website:
When Alice Fancourt returns home after having been out for the first time without her two-week-old daughter Florence, she insists that the baby she finds at home, in the care of her husband David, is not their daughter but a child she has never seen before. David denies it, claiming that the baby is Florence and that Alice has gone mad. Is she crazy, or is David lying, and if so, why would he do such a thing? And where is the real Florence? Alice has no proof, but she needs the police to believe her, and quickly. While they wait for the DNA test that will settle the matter, valuable time is being lost, and David’s behaviour towards Alice becomes increasingly threatening and sinister. Can Alice make the police listen to her before it's too late?