When Robert Wolff finds a strange horn he has the key to the door between universes. A door through space-time leading to a space unlike ours, built on tiers, where he has to work his way up to find out who created it.
Editions · 5
Paperback
1980 · Penguin Putnam~mass
EN
9780441516247
Hardback
1984 · Phantasia Press
224 pp · EN
9780932096074
Paperback
1984 · Berkley
EN
9780425073780
Hardback
1997 · Lightyear Press
EN
9780899683973
Paperback
2012 · Orion Publishing Group, Limited
EN
9780575119598
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