Way Down Upon a Suwanee Murder: a short ghost story

The Mackeys and the Halberts have been feuding for generations, but on one can remember why.
When Savannah met Jackson, she fell in love before she knew his last name. Now engaged, they have to end the feud so they can get married with each family's blessing. But if no one knows why the feud started, how can they end it? Savannah is sure the answer is hidden somewhere within the old—and haunted—Mackey mansion, now turned museum.