Hardy Boys Canon (1-58)
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The Secret Warning

Volume #17 in the Hardy Boys Canon (1-58) series

Ghostwriter: John Button
Summary: While searching for a million dollars' worth of treasure in a sunken ship, the boys must deal with unscrupulous diver Gus Kuntz.

Revision type: Completely rewritten; the idea of treasure in a sunken ship is retained, but is now part of an insurance fraud plot. (More about revisions.)
Ghostwriter: James Duncan Lawrence