'Genre-bending, genius . . . A superb, intoxicating book' Telegraph 'Deliciously twisty. I raced through it in one evening' The Times 'A proper read-it-in-one-go book, opening up an advent calendar of lives behind the doors of a block of flats' Adam Kay, author of This is Going to Hurt Margate is in the grip of a heatwave when David Whitehouse stumbles across the mysterious story of a local woman who lived on the ground floor of Saltwater Mansions, a block of flats not far from the sea. On paper, Caroline Lane was unremarkable. She paid her mortgage every month. She always paid her bills. But nobody had seen or heard from her for 13 years, and no one had ever come looking. She had disappeared completely. David quickly becomes as fascinated by this missing woman as the residents of Saltwater Mansions, all of whom have their own theories to share, and their own unique stories to tell. As his obsession grows, David unearths vital clues that private detectives and amateur investigators