Bradbury, Ray. Something Wicked This Way Comes (New York: Bantam, 1963, c1962) 215 p.
Charles Halloway is the Janitor of the Green Town, Illinois Town Library. His son Will and Will's friend Jim discover an evil force in a traveling carnival. Charles finds information about the carnival in the library (p. 135-38). The librarian is Miss Watriss, "the nice old lady [who] purple stamped your books" (p. 11). A Miss Wills is mentioned as the other librarian, but neither of them enter into the story. The evil Mr. Dark comes searching for Halloway and the boys in the darkened and labyrinthine library (p. 154-66).