The Desert (Spider World #1)

     Mankind once ruled planet Earth, smugly ignoring the tiny creatures crawling underfoot. Then came the cosmic catastrophe which put man at the mercy of the giant spiders, icily intelligent conquerors armed with awesome mind powers. Now, the struggle for survival begins...
     The Death Lord spiders rule the Earth, herding humans like cattle. A few tribes of free men and women dwell in the desert, hiding underground, living by their wits. Now, a young warrior named Niall begins an epic search for the secrets of the spiders - secrets which might give humanity a fighting chance against the overlords...

Edition note: while this is the first volume of the Spider World series, it was also originally (and later) part of most editions of "The Tower". The 1988 edition of "The Tower" split the formerly unified book into three, respectively "The Desert", "The Tower" and "The Fortress", leading to considerable confusion.