The characters, places, and events of Hardy Boys Casefile #31, Without a Trace (http://www.hardyboyscasefiles.com/series/casefiles.php?book_no=31), have been entered into the Hardy Boys Encyclopedia (http://www.hardyboyscasefiles.com/encyclopedia.php).
(https://www.hardyboyscasefiles.com/images/casefiles/CF031.jpg) (http://www.hardyboyscasefiles.com/series/casefiles.php?book_no=31)