On a sun-hazed afternoon in the Florida Keys, a child goes missing from the beach. Dr Mirren Fitzpatrick appeals to the world to help find her eight-year-old daughter. The family are on holiday from Ireland, far from home and desperate to return there as they arrived - together. Yet the police are immediately suspicious of Mirren. She was drinking at a bar - alone - shortly before reporting that her youngest child had disappeared. As rumours abound about Mirren's past a trial-by-media ensues, and she is turned from a figure of pity to the villain of the piece. And then a small body is found dumped in the ocean. Is Mirren a heartbroken mother, or the architect of her daughter's fate?