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Also by Mary Pope Osborne:

Soccer On Sunday, June 2014
Hardcover
Dark Day In The Deep Sea, April 2008
Hardcover
Dragon of the Red Dawn, March 2007
Hardcover
Blizzard of the Blue Moon, October 2006
Hardcover
Magic Tree House Research Guide #12: Sabertooths And The Ice Age: A Nonfiction Companion To Sunset Of The Sabertooth (A Stepping Stone Book(Tm)), March 2005
Paperback
Mummies in the Morning, September 1993
Paperback / e-Book

DARK DAY IN THE DEEP SEA
By: Mary Pope Osborne

Magic Tree House #39
Random House Books for Young Readers
April 2008
On Sale: March 25, 2008
128 pages
ISBN: 0375837310
EAN: 9780375837319
Hardcover
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Fantasy | Childrens

Jack and Annie of Frog Creek, Pennsylvania, know they have to find one of the four secrets of happiness to help save Merlin the magician. But when the magic tree house whisks them off to a misty island in the middle of nowhere, they wonder how they will find anything. As the fog lifts, they see a huge three-masted ship–could it be a pirate ship?

When a small rowboat makes its way to shore, the three men inside don’t look like pirates at all. The ship turns out to be the world’s first floating science laboratory, filled with sailors and scientists. Instead of hunting for treasure, the ship’s crew is searching for undiscovered sea creatures–and for the giant sea monster that seems to be following them!