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While on a trip to Portugal with their father, the boys go on their own hunt for gold bars, a treasure that was buried in Mrs. Rilke's childhood backyard after World War II by a defecting German soldier. Someone else has found out about the treasure and is searching for it also. Can Frank and Joe find it before it falls into the wrong hands?
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116 primary books117 released booksThe Hardy Boys is a 117-book series with 117 released primary works first released in 1920 with contributions by Franklin W. Dixon, Jerrold Mundis, and Leslie H. Morrill.
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