Random House Books for Young Readers Magic Tree House #40 Sea Otter Sunrise
Random House Books for Young Readers Magic Tree House #40 Sea Otter Sunrise

Magic Tree House #40 Sea Otter Sunrise

By Mary Pope Osborne

$6.99

Publication Date: January 6, 2026

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Ages 6 to 9, Grades 1 to 4

The #1 bestselling Magic Tree House series for chapter book readers is ready to whisk you away across the world with Jack and Annie--this time to save sea otters after a shark attack! Magic Tree House is the perfect series for kids ready to transition from leveled readers and picture books to longer novels!

It’s bright and early when the magic tree house spins Jack and Annie to Monterey Bay, California. It’s their mission to collect sea urchins in the underwater kelp forests! But they know nothing about collecting sea urchins—can a grouchy boat captain help them? Maybe. But Jack and Annie have another problem when Annie finds a badly injured sea otter. They’re not supposed to help the otter. . . but it’s the right thing to do. Can they convince the grouchy boat captain to help them?  

Did you know that there's a Magic Tree House book for every kid?
  • Magic Tree House: Perfect for readers who are just beginning chapter books
  • Merlin Missions: More challenging adventures for the experienced reader
  • Fact Trackers: Nonfiction companions to your favorite Magic Tree House adventures
  • Graphic Novels: Relive the original adventures brought to life with art by Kelly & Nichole Matthews
  • Nonfiction Graphic Novels: Track the facts in these graphic novel adaptations of the nonfiction companion novels


If you're looking for Merlin Mission #40: Eve of the Emperor Penguin, it was renumbered as Merlin Mission #12 when the series was rebranded in 2017.

Series Overview: MAGIC TREE HOUSE PUB PLAN: 

SPRING 2025: Fact Tracker Graphic Novel: Dinosaurs
SUMMER 2025: Sea Otter Sunrise (MTH #40)
FALL 2025: Midnight on the Moon Graphic Novel, Fact Tracker Graphic Novel: Space
SPRING 2026: Sea Otter Sunrise paperback (MTH #40)
SUMMER 2026: Fact Tracker Graphic Novel: Titanic
FALL 2026: Christmas in Camelot Graphic Novel

About the Author

MARY POPE OSBORNE is the author of the New York Times #1 bestselling Magic Tree House series as well as coauthor of the Magic Tree House Fact Tracker series, along with her husband, Will; her sister, Natalie Pope Boyce; and her good friend Jenny Laird.

Author Residence: Great Barrington, MA

AG FORD is a New York Times bestselling children's book illustrator and recipient of two NAACP Image Awards. He grew up in Dallas with his mom, his dad, and his two sisters and one brother. He majored in illustration at Columbus College of Art & Design and now lives with his family in Frisco, Texas.

Illustrator Residence:Frisco, TX

Format: Paperback

Pages: 112

Publisher: Random House Books for Young Readers

Publication Date: January 6, 2026

ISBN: 9780593706541

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