Dixon, Franklin W.  <br/><br/>
the hardy boys mystery stories 12   : footprints under the window  
Franklin W. Dixon  
 - New York   Grosset & Dunlap   c1933 
 - 177  illustrations   19cm  
<br/><br/> Footprints Under the Window (1933) is the 12th Hardy Boys mystery by Franklin W. Dixon. Frank and Joe investigate an espionage ring trying to steal a top-secret invention. After finding mysterious, lingering footprints and a cryptic warning from a runaway, the boys travel to South America to uncover the mastermind. 
<br/><br/><br/>English  
<br/><br/><label>Dewey Class. No.: </label>Fic. D621f 2008