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29 The Secret of the Lost Tunnel (1950): The Hardy Boys Mystery

This is a picture of the Hardy Boys Book 29 The Secret of the Lost Tunnel (1950): The Hardy Boys Mystery

Volume 29: The Secret of the Lost Tunnel

Frank and Joe dig into history when they investigate the mystery of a Civil War tunnel. As they explore underground passages and decipher old maps, the Hardy Boys uncover a plot involving hidden gold and modern-day greed. With help from their friend Chet Morton and local historians, they must race against time to solve a century-old puzzle and prevent a present-day crime.

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