1950 - At the crumbling Idlewild Hall school for unwanted girls, four room-mates begin to bond over dark secrets and whispered fears - until one of them mysteriously disappears .2014 - Journalist Fiona Sheridan can't get over the murder of her sister twenty years ago, near the ruins of Idlewild. And when another body is found during renovations of the school, she begins to uncover horrors that were meant to remain hidden - and a voice that won't be silenced.