John Bellairs's Lewis Barnavelt in The Beast Under the Wizard's Bridge

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Even after the old Wilder Creek Bridge is torn down it continues to exude a sense of deadly menace that arouses Lewis Barnavelt's curiosity ... and his deepest fears. Unable to resist the lure of its mysteries Lewis and Rose Rita discover shocking secrets and a monster so terrible that even with the help of Uncle Jonathan and the magical Mrs. Zimmermann they are barely able to save themselves -- and all humankind -- from its ferocious grasp!