The River Styx

Publisher's blurb:

Death. The Grim Reaper. The Angel of Death. There are many names given to this specter which stands on the threshold of the living world and the land unknown. Yet most agree it is not even real, a phantom, and nothing more. The river of death, the Styx, is the road to where this legend begins, the gates of the world of the dead. Yet is it, like the Grim Reaper, even real? Is it a myth? Or does this legend flow from the same source of fear? Indeed, is there a real River Styx to be found in the living world that can be explored to its end to learn the very secrets of death and immortality? There is, and you have found it...