Robert Silverberg Colonies Hardcover Return To Belzagor

"Based on Robert 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."