Lie Quiet in Your Grave — Mary Linn Roby

Lovely young Martha Fuller wanted no part of her grandmother's fortune, or Conifers, the vast isolated family mansion on the rocky Maine coast. Yet somehow, inexplicably, she found herself complying with the strange request of the will, the request that the inheritor keep her grandfather's mistress from ever returning to the mansion...a mistresss who had already been dead for forty years. It seemed like the request of a madwoman-until Martha arrived at Conifers and discovered that the long buried scandals of the past were all too easily exhumed and much too alive to allow an innocent heiress to tell the tale...