Highest Certified by CGC! This comic has a rare Double-Cover! CGC label indicates that the outer cover grades 6.5, while the interior cover grades Very Fine 8.0. The book is structurally much better, especially the inner cover and interior of the book. However, there is severe toning to the inside of both covers and a dark dust shadow evident along the spine of front cover, which caused CGC to lower the grade substantially. Thus, this book can be had at a reasonable price, even though it is the best known copy! Cool, horror-type cover art by Harry Tschida. Gardner Fox story. E.E.Hibbard and Tschida interior art.