Hardy Boys 15: The Sinister Signpost

Author: Franklin W. Dixon

Format: Paperback
Available

Quick Overview

The fifteen Hardy Boys mystery is the first book of the series to feature a more scientific approach to aspects of the mystery. The boys have been involved in secret weapons before, but this is the first time that a Hardy Boys book has acquired a slight science fiction flavor.

Hardy Boys 15: The Sinister Signpost

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