Dark Day In The Deep Sea (Magic Tree House, No. 39)
Publish Date: 2008-03-25
Author: Mary Pope Osborne
Jack and Annie continue their quest for the secrets of happinesssecrets they need if theyre going to save Merlin. But when the magic tree house leads them to a tiny deserted island in the middle of the ocean, theyre not sure who needs help moreMerlin or themselves! The brother and sister team are soon rescued by a ship of explorers and scientists. But the crew isnt looking for the secrets of happiness. The crew is looking for . . . a sea monster!