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Nancy Drew 30: The Clue of the Velvet Mask (original 1953; edition 1953)
The Clue of the Velvet Mask by Carolyn Keene (1953)
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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.
(summary from another edition)
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