The Clue of the Velvet MaskBook - 1969
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.
Publisher: New York, Grosset & Dunlap 
Branch Call Number: JF Keen
Characteristics: 177 p. illus. 20 cm.
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