The clue in the crossword cipher

Bibliographic Details
Main Author: Keene
Format: Book
Language:English
Published: New York Grosset & Dunlap 1967
Series:Nancy Drew Mystery Stories 44
Subjects:

21 MGGK

Holdings details from 21 MGGK
Call Number: FK KEE 1967
Accession Item Category Format Status Notes
0268161 Fiksyen Kanak-Kanak (FK) BOOKS AVAILABLE

KEMENTAH

Holdings details from KEMENTAH
Call Number: FK KEE 1967
Accession Item Category Format Status Notes
PH006944 Fiksyen Kanak-Kanak (FK) BOOKS WEEDED
PH006945 Fiksyen Kanak-Kanak (FK) BOOKS AVAILABLE