[The Moon by Night] is another, and independent, book about Vicky and her family, who first appeared in Meet the Austins. [The Austins are] as real a family as you find in a book….

Vicky, the narrator, meets a boy who interests her because he is so different—but he is disturbing to her family. His effect on Vicky's slightly uncertain but really firm faith in God—and in life—makes a good story, one that may, in so far as it is possible, give reassurance to girls who need it. But occasionally they may wish that Vicky and Zachary did not take themselves quite so seriously. (p. 77)

Alice Dalgliesh, in The Saturday Review (Entire issue copyright 1963 by Saturday Review Associates, reprinted with permission), May 11, 1963.

Judging by the frequency of their appearance books with some sort of gimmick involving the fourth dimension have substantial appeal for younger readers...