"From the crowded shelf of Cthulhu Mythos grimoires, only the Necronomicon of Abdul Alhazred is consulted more frequently than The Book of Eibon. But Eibon himself is less well known. Clark Ashton Smith, the creator of Eibon and his book, wrote only one story about the Hyperborean wizard, and that one dealt with the end of his life. It has been left for Smith’s disciples to imagine the episodes of his earlier existence. Gray Magic is such an episode, and easily the most elaborate of the lot. For in the course of this one novel Eibon (and Cyron, his young apprentice) must take on an army of sorcerers and a brace of gods in a quest to recover a stolen book and save the ancient world."