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Frank and Joe Hardy can’t let their friend’s father take the fall for the jewels stolen from the Tower Mansion, despite how guilty he looks. But once the teens find the real thief, a master of disguise who had everyone fooled, he dies, leaving behind a cryptic...
The Hardy Boys are elated over their good luck when wealthy Elroy Jefferson invites them to spend Christmas vacation at his private retreat on Cabin Island. But when Frank and Joe make a reconnaissance trip in their iceboat, The Sea Gull to the island, a belligerent stranger orders them off. Why? Before twenty-four hours have passed, the Hardys find themselves involved in two mysteries: the first concerns the recent disappearance of Mr. Jefferson's
...Frank and Joe Hardy receive an unusual assignment from their detective father. They are to "break into" the house of a Bayport neighbor, Malcolm Wright and retrieve a top-secret invention that the scientist had hidden in his study before leaving for California. The invention is in danger of being stolen and the boys race against time to beat the thieves at their own game. The young detectives soon discover that they are involved in a mystery far
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