When the seven-year-old daughter of a young widow unexpectedly vanishes, a dark family secret could hold the answers. When her aunt Gwyn dies unexpectedly, Lowri returns once more to her childhood holiday home on the remote island of Anglesey, Wales, this time with her young daughter Ruby in tow. Lowri hadn't seen her aunt nor her cousins in years, but the beautiful coastal island and remaining family members offer solace, and a much-needed break. Soon Ruby begins to insist an old woman that no one else ever sees is playing with her, and Lowri herself experiences odd occurrences, the safe haven Lowri remembered feels like it's starting to turn on her. Then the worst happens, Ruby goes missing. Suddenly Lowri finds herself digging into her family history to find her child, but the past is more deadly than Lowri could have ever imagined - and will it be enough to bring Ruby back?