The Mark on the Door

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The Mark on the Door is Volume 13 in the original The Hardy Boys Mystery Stories published by Grosset & Dunlap.
This book was written for the Stratemeyer Syndicate in 1934, purportedly by Leslie McFarlane however the writing style is noticeably different from other books in the series known to have been written by McFarlane. 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 1967 by Tom Mulvey resulting in two different stories with the same title.