Chick, Bryan. <br/><br/>
The secret zoo / 
Bryan Chick. 
 - New York :  Greenwillow Books,  2010. 
 - 295 p. ;  22 cm. 
 - The secret zoo : 1 .
<br/><br/> When his sister disappears, Noah, along with their best friends, Ella and Richie, sneak into the neighborhood zoo and delve into the unknown world of the animals, where they discover a great secret that the zoo is protecting. 
<br/><br/> Ages 9-12. 
<br/><br/><label>ISBN: </label>9780061987519 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mystery and detective stories.<br/>Zoos--Fiction.<br/>Zoo animals--Fiction.<br/>Missing children--Fiction.<br/>Friendship--Fiction.