"The cover art used for all printings of the revised edition, this format with the flash light at the top was first used in 1987."@en . . "Rudy Nappi"@en . . . . "The Mark on the Door"@en . . . . "The Hidden Harbor Mystery (revised text)"@en . "__WIKIA_BANNER__ The Hidden Harbor Mystery is the 14th book in The Hardy Boys series. It was first published in 1935 and the revised edition was published in 1961."@en . "The Hidden Harbor Mystery"@en . . . "The Hardy Boys"@en . . . "Hardcover"@en . "The Sinister Signpost"@en . "__WIKIA_BANNER__ The Hidden Harbor Mystery is the 14th book in The Hardy Boys series. It was first published in 1935 and the revised edition was published in 1961."@en . . . . .