Ace, New York, 1985, 1st Ed., Ace Original.  ISBN 0-441-24092-5.  MMPB, 186 pages.  Light edge wear, binding tight with tanned pages; appears unread.  ‘There were seven cities in the chasm … built to cling to the great cliff wall, woven into the massive roots of the flattrees!  Once there had been eight cities – but the eighth had disappeared one night, fallen into the chasm’s mysterious depths.  No one had ever ventured to the bottom of the chasm.  No one had dared, in spite of tales of the lost city’s treasure.  Until the bird-woman Mavin came like a messenger of heaven to lead the people of the chasm on a fabulous, dangerous quest…’ (from rear wrap)