The house on the cliff has been vacant and is supposed to be haunted. Then it is reported to be the abode of criminals. Mr. Hardy starts to investigate and disappears, so the boys set to work to see what they can do.
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When...
Counterfeit money is in circulation, and the limit is reached when Mrs. Hardy takes some from a stranger. Then the Hardy boys and their high school chums are warned to stay away from the old mill. Their curiosity plunges them into peril of the...
When puzzle columnist Savannah Stone's editor is found stabbed to death, the police look at her as the prime suspect. But Savannah knows she wasn't the only puzzle-maker to cross words with...