Osborne, Mary Pope. <br/><br/>
Dark day in the deep sea  
by Mary Pope Osborne ; illustrated by Sal Murdocca. 
 - 1st ed. 
 - New York :  Random House,  c2008. 
 - 106 p. :  ill. ;  22 cm. 
 - Magic tree house series ;  #39 .
 - Osborne, Mary Pope.  Magic tree house series ;  #39. .
<br/><br/> "A Merlin mission."  "A Stepping Stone book." 
<br/><br/> When eight-year-old Jack and his seven-year-old sister, Annie, join a group of nineteenth-century explorers aboard the H.M.S. Challenger, they learn about the ocean, solve the mystery of its fabled sea monster, and gain compassion for their fellow creatures. 
<br/><br/> 520  Lexile. 
<br/><br/><label>ISBN: </label>9780375837319  11.99 9780375937316 (lib. bdg.) 9780375837326 (pbk.) 
<br/><br/><label>LCCN: </label>2007029717 
<br/><br/><label>Subjects--Corporate Names: </label><br/>Challenger (Ship : 1872-1876)--Juvenile fiction.
<br/><br/><label>Subjects--Topical Terms: </label><br/>Oceanography--Juvenile fiction.<br/>Compassion--Juvenile fiction.<br/>Time travel--Juvenile fiction.<br/>Magic--Juvenile fiction.<br/>Tree houses--Juvenile fiction.<br/>Brothers and sisters--Juvenile fiction.
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Fantasty fiction.
<br/><br/><label>Dewey Class. No.: </label>[Fic]