Lesley and her husband Mack are the sudden winners of a 15 million EuroMillions jackpot. They move to an exclusive gated estate in Buckinghamshire with their fifteen-year-old daughter Rosie, leaving behind their ordinary lives - and friends - as they are catapulted into wealth beyond their wildest dreams. But the dream soon turns into their darkest nightmare when, one beautiful spring afternoon, Lesley returns to their house to find it empty. Rosie is gone. DC Maggie Neville is assigned to be Family Liason Officer to Lesley and Mack, supporting them while quietly trying to investigate the family. But a crisis in her own life is also troubling Maggie - a secret from the past that, if revealed, could shatter everything she's worked so hard to build. As Lesley and Maggie desperately try to find Rosie, their fates hurtle together on a collision course that threatens to end in tragedy...