Avon, New York, 1977, 3^rd pr.  ISBN 0-380-01664-8.  MMPB, 188 pages.  Good; wraps show edge and cover wear, creases and reading creases.  Binding sound; interior clean and unmarked with tanned pages.  ‘Family blood has been spilled on the magic pattern that created Amber.  To save themselves from the dagger-wielding hand that stabs across the nebulous boundaries of the parallel worlds, the remaining Princes – led by the superhuman Lord Corwin – must find the murderous traitor in their midst … and discover the source of the black road that unites the one true world of Amber with the multi-dimensional realm of Shadow.’ (from rear wrap)