Hardy Boys Canon (1-58)
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(The) Mystery of the Flying Express

Volume #20 in the Hardy Boys Canon (1-58) series

Ghostwriter: John Button
Summary: The boys foil a foreign spy training operation using the "Flying Express" train.

Revision type: Completely rewritten, with no plot elements retained from the original; the new story involves the disappearance of the "Flying Express" hydrofoil. (More about revisions.)
Ghostwriter: Vincent Buranelli