The Last Daughter by Nicola Cornick

Ever since her sister disappeared eleven years ago, Serena Warren has been running from a ghost, haunted by what she can’t remember about that night.

When Caitlin’s body is discovered, Serena returns to her grandfather’s house, nestled beside the ruins of Minster Lovell Hall in Oxfordshire, determined to uncover the truth. But in returning to the place of her childhood summers, Serena stands poised at the brink of a startling discovery – one that will tie her family to a centuries-old secret…