Cal McGill is a unique investigator and oceanographer who uses his expertise to locate things--and sometimes people--lost or missing at sea. His expertise could unravel the haunting mystery of why 26 years ago on a remote Scottish beach Megan Bates strode out into the cold ocean and let the waves wash her away. Megan's daughter Violet Wells was abandoned as a baby on the steps of a local hospital just hours before. As McGill is drawn into Violet's search for the truth he encounters a coastal community divided by obsession and grief and united only by a conviction that its secrets should stay buried.