Keene, Carolyn, <br/><br/>
The secret of the old clock / 
by Carolyn Keene. 
 - iv, 210 pages ;  20 cm 
 - Nancy Drew mystery stories ;  [1] .
 - Keene, Carolyn.  Nancy Drew mystery stories ;  1. .
<br/><br/> Series number from website (http://en.wikipedia.org/wiki/List_of_Nancy_Drew_books) viewed May 12, 2020.  Publication date inferred from list of titles at front of book which concludes with: The Hidden Window Mystery which was published in 1956.  Blue tweed covers and digger endpapers and plain paper frontispiece. 
<br/><br/><label>Subjects--Personal Names: </label><br/>Drew, Nancy (Fictitious character) --Juvenile fiction.<br/>Drew, Nancy (Fictitious character) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Women detectives--Juvenile fiction.<br/>Detective and mystery stories.<br/>Teenage girls--Juvenile fiction.<br/>Teenagers--Juvenile fiction.<br/>Mystery and detective stories.<br/>Women detectives.
<br/><br/><label>Subjects--Index Terms: </label>Clock (general) USA Clock Fiction 
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Detective and mystery fiction.<br/>Fiction.<br/>Juvenile works.<br/>Detective and mystery fiction.