. . . . "__WIKIA_BANNER__ Hopping Mad is the fifth book in The Hardy Boys: Secret Files series. It was published in April 2011 by Aladdin Paperbacks."@en . . . . . . "The Hardy Boys: Secret Files"@en . . "2011-04-05"^^ . "A Monster of a Mystery"@en . "A Monster of a Mystery"@en . "__WIKIA_BANNER__ Hopping Mad is the fifth book in The Hardy Boys: Secret Files series. It was published in April 2011 by Aladdin Paperbacks."@en . . . . "Paperback"@en . "Hopping Mad"@en . .