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The 100-Year-Old Secret (Turtleback School & Library edition)

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Xena and Xander Holmes discover they are related to the famous detective Sherlock Holmes and inherit his casebook. The siblings set out to solve the cases their ancestor could not, and they begin with the mystery of a prized painting that vanished more than a century ago. Illustrations.

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

ISBN-13: 9780312602123

Trade paperback

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The 100-Year-Old Secret 2010, Turtleback Books

ISBN-13: 9780606215862

Turtleback School & Library edition

Hardcover

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The 100-Year-Old Secret 2010, Perfection Learning

ISBN-13: 9781613833728

Hardcover

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

ISBN-13: 9780805083408

Hardcover

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