Skip content
Get two free audiobooks AND support local bookstores Make the switch
Dark Day in the Deep Sea by Mary Pope Osborne
  Send as gift   Add to Wish List

Almost ready!

In order to save audiobooks to your Wish List you must be signed in to your account.

      Log in       Create account
Phone showing make the switch message

Limited-time offer

Get two free audiobooks when you make the switch!

Now’s a great time to shop indie. When you start a new membership supporting local bookstores with promo code SWITCH, we’ll give you two bonus audiobook credits at sign-up.

Make the switch
Libro.fm app with gift bow

Gift audiobook credit bundles

You pick the number of credits, your recipient picks the audiobooks, and your local bookstore is supported by your purchase.

Start gifting

Dark Day in the Deep Sea

$8.00

Narrator Mary Pope Osborne

This audiobook uses AI narration.

We’re taking steps to make sure AI narration is transparent.

Learn more
Length 1 hour 17 minutes
Language English
  Send as gift   Add to Wish List

Almost ready!

In order to save audiobooks to your Wish List you must be signed in to your account.

      Log in       Create account

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!

The magic tree house leads Jack and Annie to a tiny deserted island in the middle of the ocean. The brother and sister team are soon rescued by a ship of explorers and scientists who are looking for…a sea monster!

Formerly numbered as Magic Tree House #39, the title of this book is now Magic Tree House Merlin Mission #11: Dark Day in the Deep Sea.

Did you know that there’s a Magic Tree House book for every kid?

Magic Tree House: Adventures with Jack and Annie, perfect for readers who are just beginning chapter books
Merlin Missions: More challenging adventures for the experienced reader
Super Edition: A longer and more dangerous adventure
Fact Trackers: Nonfiction companions to your favorite Magic Tree House adventures

Mary Pope Osborne is the author of all the Magic Tree House books, as well as American Tall Tales and New York’s Bravest for Knopf. The author lives in Goshen, CT.

Mary Pope Osborne is the author of all the Magic Tree House books, as well as American Tall Tales and New York’s Bravest for Knopf. The author lives in Goshen, CT.

Phone showing make the switch message

Limited-time offer

Get two free audiobooks when you make the switch!

Now’s a great time to shop indie. When you start a new membership supporting local bookstores with promo code SWITCH, we’ll give you two bonus audiobook credits at sign-up.

Make the switch
Libro.fm app with gift bow

Gift audiobook credit bundles

You pick the number of credits, your recipient picks the audiobooks, and your local bookstore is supported by your purchase.

Start gifting
Get two free audiobooks AND support local bookstores Make the switch