The clue of the velvet mask

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.

Grosset & Dunlap
1969
9780448195308
book
Lexile: 
700

Holdings

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3511684179016225816351470865DANE145DANE01288FIC KEE100015774597521709567815