The Hardy boys mystery stories 
 What happened at midnight 

 - New York  Grosset & Dunlap  1992 
 - 180 p.  ill. 
 - The Hardy boys mystery stories .
<br/><br/> Frank and Joe race against time to retrieve a scientist's top-secret invention before thieves get their hands on it. But the young detectives soon discover that they are involved in a mystery far greater in scope than just safeguarding the invention. When Joe is kidnapped, this incident starts Frank of on a chase that could end disastrously for him and his pals. 
<br/><br/><label>ISBN: </label>9780448089102 
<br/><br/><label>Dewey Class. No.: </label>[Fic]