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Dark Day in the Deep Sea (Magic Tree House, #39)
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Dark Day in the Deep Sea (Magic Tree House #39)

3.96 of 5 stars 3.96  ·  rating details  ·  2,627 ratings  ·  95 reviews
Take the plunge with Jack and Annie!

Jack and Annie continue their quest for the secrets of happiness—secrets they need if they're going to save Merlin. But when the Magic Tree House leads them to a tiny deserted island in the middle of the ocean, they’re not sure who needs help more—Merlin or themselves! The brother and sister team are soon rescued by a ship of explorers a
Paperback, 144 pages
Published April 27th 2010 by Random House for Young Readers (first published 2008)
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Community Reviews

(showing 1-30 of 3,000)
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Charissa Sophia de la Rosa
We learn that deep under the sea, there are dangerous sea animals like the octopus and sharks.
I loved this book! Mary Pope Osborne really catches your imagination. She tells facts and fiction at the same time. You will keep on reading it because it catches your attention like a flytrap. In this book, Jack and Annie go back in time and save a giant octopus. I love the ocean because it is a totally different world, which Jack and Annie get to experience. If you read this book, I bet you will love it, too.
As I was reading this, I thought "all right, this one really has dramatic tension, they really do get better as the series progresses." But then MPO took out a 2-by-4 and starting hitting us over the head with it. Oof. We get it! All life is precious! But how are scientists going to understand the sea and the creatures within if they can't study it? Anyway, too much preaching. Enthusiasm balloon seriously deflated.
Mary Lee
My adult brain fought with the idea of the octopus speaking out loud to the sailors and early oceanographers. And while I agree with the *moral* of the story that one of the secrets to happiness is compassion for all living creatures, it seems like MPO has trivialized the way this could have been/can be/needs to be accomplished.
Alejandra torres
In my opinion, Dark Day in The Deep sea(Magic Tree house,#39)is a great book because the author Mary Pope Osborne made the book have a look of details because its about sea creatures that been in the past, and scientists figuring out if there still out there.I can prove that this had a lot of DETALIS because it said in the text "This Dunkleosteus was part of a family whose name means 'Terrible fish." And they were really TERRIBLE! These twenty-foot-long predators lived about 400 million years ag ...more
Marco De La Rosa
This book is a good book if you want to learn about the real beuaty and magic about wondorous sea monsters. Sea monsters may look ugly and nasty but the truth is they csn help you and they won't hurt you if someone just act respectful. When jack and annie travel to this time where captain and sailors sailed back then, the have noticed a big, humungous octopus who tries to encounter them but the sailors get worried and the capitan orders the sailors to attack that nasty maonster before they all l ...more
Jean O'Shea
Dark Day in the Deep Sea by Mary Pope Osbourne is the 39th installment in the early reader series. In each book, the protagonists Jack and Annie discover, in their local grove of trees, a magic tree house that whisks them off on an adventure. Generally, they have a book as a guide and an important task to complete. This series is aimed at the K-3rd grade set.

I love Magic Tree House series! I can always count on its pattern of chapters: discover the tree house and task, begin adventure with confi
Christopher Salcedo
I like this book because in the book it states, 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 then 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.(pg.1) ...more
Kariata Toure
I like the book Dark Day in the Deep Sea because I learned a lot of facts and it adventures."Water covers three-quarter of our earth.Most of the ocean is an enormous plain a little more than two miles deep.But some oceans trenches are more than six miles deep."#12 Another fact I learn was"The ocean is home to thousands and thousands of sea creatures.Mountains and volcanoes are also hidden deep beneath the surface of the sea."#12 The Dark Day in the Deep Sea is adventures"Morgan sent as to tell ...more
It was a good book. this book is Dark Day in the Deep Sea. The author is Mary Pope Osborne. It is a realistic fiction. It had 105 pages. The main characters are Jack and Annie. They are by the Pacific Ocean. The theme was to find the secret of happiness. The plot was getting rescued and the helping out the octopus. The hints about conclusion was all of their bottles of sea creatures. I liked this book and think you would too.
Maya Orama
This story is about a girl and boy named Jack and Annie . Jack and Annie went into the library then out. Jack hid lots of books in his bag. Then they start to run. They both found teddy and Kathleen. Teddy and Kathleen told Jack and annie to take books from the library so the tree house can have more books in the magic tree house. They boo looked for a books that they wanted to go into. It was a pirate book. They wished that they were in it, then they got teleported on the ship of a pirate crew. ...more
Damrais Marc
This month I read a book called "Dark Day in the Deep Sea" by Mary Pope Osborne. I liked this book because it's adventurous. This book is about two little kids named Jack and Annie. They own a magical tree house. The magic tree house takes them on journeys.
My kids like this more than I do. I find all the dialogue to be quite perfunctory and repetitive... BUT I was really impressed with how many of the facts in this book were learned and retained by my 5-year-old son. For example, we started reading and Eyewitness Ocean book after this and he recognized the HMS Challenger which was mentioned in both books, as well as the image of the Nautilus, and knew what it was. Very cool! WE were given this book with a few others, so we started here because my ...more
I liked it. They were trying to help the ship, but then they were thrown off deck and an octopus saved them. Then the ship people caught it and were trying to kill it, but then they stopped.
Sophie V
I liked this book because I found the octopus very funny. I also liked how I learned facts while reading a fiction story. (Sophie, Age 7)
Jack and Annie almost sunk! Jack and Annie went on the "HMS Challenger." A giant octopus saved them!
The series is about two kids named Jack and Annie who have a magic tree a few blocks away from their house. In this book, they go to the ocean and meet sailormen. Then they get on her majesty's ship, The Challenger and they go to a professor's lab where they see everything he has gotten from the sea. Then the ship floods and they fall off of it. They get attacked by an octopus. Then they capture the octopus and Jack and Annie realize the octopus was trying to save them, not hurt them. Then they ...more
Maddison Vv
i think it was very good and very like you could guess what was coming next in the book
I Liked dark day in the deep sea
The Magic Tree House books are a MUST READ collection for all children. Unlike many other series for young readers, the Magic Tree House should be read in chronological order to best appreciate Jack and Annie's travels through time as they go on various missions; which are typically completed in four parts. Parents and educators will enjoy going along for the ride as much as their students! My daughter is a teenager now but she still gets excited when she sees a new tree house adventure has come ...more
Patti K
This one is maybe 3.5. Not that it's her fault my kid likes Jack and Annie and isn't really the target age, but the stories seem somehow a little more scary than they used to be before they were Merlin Missions. Still, we liked it and we'll keep going. These stories are longer, so they take us a lot longer to read, anyway (plus, she now brings a book home from school every week), but this one felt especially long. I guess that's probably why I just liked it and didn't 'really like it' or think ' ...more
Jack and his little sister Annie are two regular kids from Frog Creek, Pennsylvania... until they discover a mysterious tree house full of all sorts of books. From that point on their lives will never be the same again! They soon go on amazing adventures (plus children are learning bits of history and most don't realize it) as they travel through time with the help of the magic tree house. The chapters are short with pictures every few pages, making these books perfect for the beginning reader. ...more
Jun 02, 2015 Rachelolivia marked it as to-read  ·  review of another edition
Shelves: own
Jack and Annie went on a boat with these scientists and they called this thing a great beast and Jack and Annie were wondering what that was. Then there was a storm and they got tossed overboard. This octopus saved them and the ship was coming close and they pulled them up and they said you got caught by the beast. They said, "No, he's not a beast. He is friendly." Just as she was saying that they were capturing the octopus and he said,"Me Not Monster. Want Go Home."
Jack and Annie search for the secret of happiness then they think they saw pirates but they noticed they were sailors so they trusted them so they got into a huge mess.They also met a giant octopus,it was a peaceful creature. Jack and Annie tried to tell the sailors that it was peaceful, but they did'nt listen. Then they got out thier axes, pistols, rifles and then the secret to happiness was that creatures need to get taken care of in some way
Dec 30, 2009 Dolly rated it 3 of 5 stars
Recommends it for: parents reading with their children
This is another good book in the "Magic Tree House" series. Our girls love Jack and Annie and we've read so many of their adventures, they are very familiar to us. This story started off a bit slow for us, but once we got into the action, we didn't want to stop until we'd read the whole book. It was an interesting look at ocean exploration in the 1800s and the addition of a talking octopus was a bit fantastic, but fun.
Jack and Annie traveled back in time to an island beach in the Pacific Ocean. They were picked up by a wooden ship with a crew of ocean scientists. Jack and Annie were swept off the ship in a storm and were rescued by a giant octopus. The ocean scientist gave them a giant shell. The ship took them back to the beach. If you ever travel to an island in the Pacific, you should look out for the giant octopus.
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Mary Pope Osborne has channeled a lifelong love of exploration and travel into one of the most popular children’s book series of the past two decades. With her fantastic Magic Tree House series, Mary Pope Osborne keeps the good times rolling for kids all over the world.
More about Mary Pope Osborne...

Other Books in the Series

Magic Tree House (1 - 10 of 53 books)
  • Dinosaurs Before Dark (Magic Tree House, #1)
  • The Knight at Dawn (Magic Tree House, #2)
  • Mummies in the Morning (Magic Tree House, #3)
  • Pirates Past Noon (Magic Tree House, #4)
  • Night of the Ninjas (Magic Tree House, #5)
  • Afternoon on the Amazon (Magic Tree House, #6)
  • Sunset of the Sabertooth (Magic Tree House, #7)
  • Midnight On The Moon (Magic Tree House, #8)
  • Dolphins at Daybreak (Magic Tree House, #9)
  • Ghost Town at Sundown (Magic Tree House, #10)
Dinosaurs Before Dark (Magic Tree House, #1) The Knight at Dawn (Magic Tree House, #2) Mummies in the Morning (Magic Tree House, #3) Pirates Past Noon (Magic Tree House, #4) Night of the Ninjas (Magic Tree House, #5)

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“I do love it. But I want you two to have it. Today, you taught me- no, you taught all of us- an important lesson. It is a dark day in the deep sea when we cause innocent creatures to suffer. The professor said we can conquer our fears through knowledge. But you taught us that our fears can best be conquered through compassion. Even we scientists must never forget to have compassion for all living creatures. My compassion for the little creature that once lived in this shell made me very happy.” 8 likes
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