The Anderson Twins

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<p>During spring break, Shelby and Daniel Anderson helped the police solve "The Case of the Missing Girl." Now they are back in school, and the principal calls them into her office. She tells them about a secret passageway she discovered behind a bookshelf in her office. Things are also turning up missing in the school. Will Shelby and Daniel be able to solve both mysteries before the end of the school year?</p>

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