My Sister's Bones Penguin

Kate Rafter has spent her life running from her past. But when her mother dies, she's forced to return to Herne Bay - a place her sister Sally never left. But something isn't right in the old family home. On her first night Kate is woken by terrifying screams. And then she sees a shadowy figure in the garden... Who is crying for help? What does it have to do with Kate's past? And why does no one - not even her sister - believe her?