The clue of the velvet mask.
Series: Her Nancy Drew mystery stories, 30
Publisher: Grosset & Dunlap
Published: 1969
Place of publication: New York
Language: eng
Number of pages: 177
Subjects: Detective and mystery stories -- Juvenile fiction
Genres: Juvenile fiction
Description: When a gang that uses parties as a cover for robberies victimizes a masquerade party Nancy is attending, the teen-age detective switches identity with her girl friend to solve the case.
Notes: j-80246