The spirits of the dead have walked among our legends, myths, and stories since before recorded history. Ghostly visitations, hauntings, unquiet souls seeking the living, vengeful wraiths, the possibility of life beyond the grave that can somehow reach out and touch us are some of literature's most enduring icons. Now, in the twenty-first century, we are no less fascinated with phantoms than our cave-dwelling ancestors or our Victorian-age forebears...