Beyond the Blue Event Horizon
Pohl, Frederik. Beyond the Blue Event Horizon. New York: Ballantine, 1980. [S. F.] Book Club Edition: New York: Ballantine, 1980 (alternate pagination).
Sequel to Gateway (q.v.). See under Literary Criticism the TMG essay by T. Paul, and the "The Heechee Series" entry by Clyde Wilcox[] For a general discussion of the Heechee, see Wikipedia entry.