
The Mark on the Door
Hardy Boys seriesbook 13 of 93The Hidden Harbor Mystery(1935) →
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"BEWARE OF THE MARK ON THE DOOR!"
A sinister warning spells danger for the Hardy Boys. For the mysterious mark - the sign of the flaming sticks - leads them to the remote mountains of Mexico in search of a kidnapped scientist.
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But in solving the secret of the strange symbol, Frank and Joe fall into the hands of some merciless bandits...
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