When Frank and Joe's friend Phil, who works for a manufacturer of highly classified, high-tech military equipment, disappears, they are on the trail of what leads to be not only kidnapping but a massive threat to global security.
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38 primary booksThe Hardy Boys Casefiles is a 38-book series with 38 primary works first released in 1987 with contributions by Franklin W. Dixon, Jacqueline Carroll, and 2 others.
