A Darkover Tale. Haunted by the mysterious images of dark, hooded figures and the cawing of strange birds and drawn by the memory of two lost comrades, Magdalen Lorne, Chief Terran operative on Darkover, must pursue her quest, not only to the frozen ends of the physical world, but to the limits of the spiritual overworld as well.  For to find this city that no man has ever seen, she will be tested as she never has before by the evil sorcery of the Dark sisterhood.