Yes, it is. There are many accounts and rumors in Savannah about haunted places and events which might have inspired this story.
Indeed, it is based on a true story. Savannah is known for its haunted history. The city has a certain charm and mystery that lends itself well to such stories. The story might be based on real - life experiences of people who claim to have encountered the paranormal in Savannah. It could involve things like cold spots in certain areas, objects moving on their own, or feelings of being watched, all of which are often associated with haunted places in Savannah.