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The 100-Year-Old Secret - Barrett, Tracy, Ms.

Xena and Xander Holmes have just discovered they are related to Sherlock Holmes and have inherited his unsolved casebook. Now the siblings set out to solve the cases their famous ancestor couldn't, starting with the mystery of a prized painting that had disappeared more than a century ago.

The 100-Year-Old Secret 2010, Square Fish, New York, NY

ISBN-13: 9780312602123

Trade paperback

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The 100-Year-Old Secret 2010, Turtleback Books

ISBN-13: 9780606215862

Hardcover

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The 100-Year-Old Secret 2008, Henry Holt & Company, New York, NY

ISBN-13: 9780805083408

Hardcover

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