Out on the far boundaries of the solar system, in the Oort Cloud, intelligent life has been discovered by humanity's space probes. Now the first humans to venture beyond the planetary system have been sent to make contact with this incredibly strange race and to tour the center of their civilization. What they discover is explosive beyond their wildest dreams.
"Spectacular from beginning to end." - Vernor Vinge
September 1993 : USA Hardback
August 1996 : USA Mass Market Paperback