Orton, Helen Fuller,  1872-1955. <br/><br/>
Mystery of the hidden book; 
illustrated by Robert Doremus. 
 - [1st ed.] 
 - Philadelphia,  Lippincott  [1953] 
 - 119 p.  illus.  21 cm. 
<br/><br/> Four children tasked with searching Professor Barton's large house for a valuable book hidden in a secret room discover they are not the only ones sleuthing. 
<br/><br/><label>LCCN: </label>53007142  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mystery and detective stories.
<br/><br/><label>LC Class. No.: </label>PZ7.O779  / Mysk