Hardy Boys Canon (1-58)
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The Secret of the Caves

Volume #7 in the Hardy Boys Canon (1-58) series

Ghostwriter: Leslie McFarlane
Summary: A woman asks the boys to track down her missing brother, whom they discover is suffering from amnesia and living as a hermit in the caves near Bayport.

Revision type: Completely rewritten; missing-man story retained as a subplot, but new main plot involves sabotage of a radar station. (More about revisions.)
Ghostwriter: Andrew E. Svenson