When Lesley and her husband Mack are the sudden winners of a £15 million EuroMillions jackpot, they move with their 15-year-old daughter Rosie to an exclusive gated estate in Buckinghamshire, leaving behind their ordinary lives—and friends. But it soon turns into their darkest nightmare when Lesley returns to their house to find it empty: their daughter Rosie is gone. DC Maggie Neville is assigned to be Family Liaison Officer to Lesley and Mack, but she has a crisis threatening her own life—a secret from the past that could shatter everything she's worked for.