Based on Silverberg's bestselling sci-fi novels about humanity's search for immortality out among the stars, this three-volume series begins with Silverberg's homage to Joseph Conrad's Heart of Darkness. Ex-lieutenant Eddie Gundersen returns to Belzagor on a scientific expedition to the borders of the indigenous lands, where he must face his nemesis, Kurtz, and his own inner demons on a planet which still has hidden secrets.