Book details
Dark Day in the Deep Sea
Published in
2008
on Goodreads (4,900)
Description
Jack and Annie continue their quest for the secrets of happiness to save Merlin. The Magic Tree House takes them to Antarctica, where they learn about happiness from penguins, and to a deserted island where they are rescued by explorers searching for a sea monster. This book was formerly known as Magic Tree House #39, and is now renumbered as Merlin Mission #11.