First printing with complete numberline: a paperback original per ISFDB. Good to very good vintage condition. Owner's name and opinion of the story marked to the inside front wrapper.stamps No prairie dogs peeked at Eros Ranch, nor did the scorpions dance. Even the trees hung still. Which is not to say there was no life. Something lived. Something unseen that exuded menace. Something that had taken all the healthy life of the desert and had perverted it to its own blasphemous ends. Something that waited. What starts out as a vacation in the Nevada mountains turns into a hideous nightmare for young Dr. Robert Costaign and his colleague, Dr. Patricia Symington. Like others before them, they find themselves face to tface with ahorrifying and deadly plague--a plague that threatens to destroy not only them, but the entire countryside . . .