Melanie Trenholm should be anticipating Christmas with nothing but joy -- after all, it's only the second Christmas she and her husband, Jack, will celebrate with their twin toddlers. But the ongoing excavation of the centuries-old cistern in the garden of her historic Tradd Street home has been a huge millstone, both financially and aesthetically. Local students are thrilled by the possibility of unearthing more Colonial-era artifacts at the cistern, but Melanie is concerned by the ghosts connected to it that have suddenly invaded her life and her house -- and at least one of them is definitely not filled with holiday cheer. . . .