The Sinister Signpost

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The Sinister Sign Post is Volume 15 in the original The Hardy Boys Mystery Stories published by Grosset & Dunlap.
This book was written for the Stratemeyer Syndicate by Leslie McFarlane in 1936. Between 1959 and 1973 the first 38 volumes of this series were systematically revised as part of a project directed by Harriet Adams, Edward Stratemeyer's daughter. The original version of this book was rewritten in 1968 by Tom Mulvey resulting in two different stories with the same title.