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Book, 2004
Current format, Book, 2004, , All copies in use.
Book, 2004
Current format, Book, 2004, , All copies in use. Offered in 0 more formats
In The house on the cliff, Mr. Hardy disappears while investigating a mystery surrounding a vacant house rumored to be either haunted or a hideout for criminals. In The ghost at Skeleton Rock, the boys travel to Puerto Rico to investigate the mystery behind a secret coded letter that they received from their father. In The sting of the scorpion, Frank and Joe witness an explosion in the sky near an airborne dirigible owned by Quinn Air Fleet while Mr. Hardy investigates a ruthless gang of terrorists.
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