"Magic Tree House #39: Dark Day in the Deep Sea"
Available March 25th 2008



ABOUT THIS BOOK
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!

Mary Pope Osborne takes young listeners on a stormy and thrilling ocean adventure packed with 
history, mystery, and magic.

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Library Edition
Magic Tree House: Books 38 & 39: Monday with a Mad Genius, Dark Day in the Deep Sea     

Title Description
Monday with a Mad Genius
Jack and Annie know they have to search for one of the four secrets of happiness to help Merlin the magician find joy in his life again. And so they head off in the magic tree house for Florence, Italy, in the early 1500s to spend the day with one of the greatest artists and inventors of all time–Leonardo da Vinci!

Dark Day in the Deep Sea
Jack and Annie know they have to find one of the four secrets of happiness to help save Merlin. 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 ship that turns out to be the world’s first floating science laboratory. The ship’s crew is searching for undiscovered sea creatures–and for the giant sea monster that seems to be following them!