Hardy Boys Canon (1-58)
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The Sinister Signpost

Volume #15 in the Hardy Boys Canon (1-58) series

Ghostwriter: Leslie McFarlane
Summary: The boys track down a stolen racehorse and save Bayport from destruction by the madman Vilnoff.

Revision type: Completely rewritten; two elements (a stolen racehorse and an evil inventor) are retained, but the plot is otherwise completely different, involving the theft of top-secret racecar engine plans. (More about revisions.)
Ghostwriter: Tom Mulvey