Keene, Carolyn <br/><br/>
1 The Secret of the Old Clock. /2 The Hidden Staircase. 

 - New York, NY :  Grosset & Dunlap,  1987. 
 - Nancy Drew Mystery Stories .
<br/><br/><label>ISBN: </label>0-448-09570-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mystery--Fiction