The Clue in the Crumbling Wall (Nancy Drew No. 22) in hardcover format by Keene, Carolyn. Published by Grosset & Dunlap in 1973. Available in Used - Very Good condition.
Carolyn Keene is the pseudonym of the authors of both the Nancy Drew Mystery Stories (and a spin-off called River Heights) and The Dana Girls Mystery Stories, both produced by the Stratemeyer Syndicate.
