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Grandi Libri #5

The Treasure of the Sea

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Thea Stilton and the Thea Sisters are needed to help another magical land. The music of the sea has disappeared from the depths of the enchanted Land of the Ocean! If it doesn't return soon, the kingdom will perish.

The mouselets and their friend Will Mystery travel to the underwater realm to search for the magical music. On their way, they swim through dangerous waters, reveal an ancient mystery, and encounter many hidden, fantastical creatures -- some friendlier than others. It's an aquatic adventure!

320 pages, Hardcover

First published January 1, 2015

329 people are currently reading
1610 people want to read

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Thea Stilton

520 books967 followers

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5 stars
1,197 (63%)
4 stars
379 (20%)
3 stars
231 (12%)
2 stars
48 (2%)
1 star
29 (1%)
Displaying 1 - 30 of 77 reviews
Profile Image for yuvi • ia.
188 reviews105 followers
Read
August 24, 2025
i read this when i was, like, 9. so, no one will say anything to me🤫🤫
Profile Image for Dhriti.
242 reviews
October 21, 2021
It’s 1 am and I just finished this little book and so much nostalgia hahah.

The seven roses unit and mouseford academy and all the fantasy worlds.

It was beautiful + I’m a sucker for anything underwater that has sunlight filtering through it and these illustrations 100% did it justice.

Colette is my FAVOURITE. I love her!!

And this series just brings back so many memories awww <3
Profile Image for Patricia.
557 reviews
January 2, 2018
p. 103-104 I believe I have found an error here. See if you can spot it.

"How's everyone doing?" I asked. (Thea talking)

"I don't know Thea," Nicky replied. "There's something STRANGE going on. I know that I shoudn't look down, but it's as if a COLD CURRENT is trying to pull me to the bottom."

"That is the CHALLENGE of the abyss," said Will. "its's not going to be easy. But we can't give up!"

"Collette's right," said Violet, who was at the end of our chain. "I know I shouldn't look down, but I feel like I have to. I CAN'T RESIST!"

Did you find it? Thea asks a question. Nicky responds. Will adds to the conversation. Then when Violet adds her comment in, she says that COLLETTE is right instead of Nicky. The error would end there except for what happens next. Collette and Violet start being pulled down into the abyss. Where did Nicky go? Don't worry, she is up there somewhere safe from the invisible force of the abyss. The error really ends up being this. COLLETTE should have answered Thea not Nicky.

Yes, I'm an odd one for noticing this.
Profile Image for Lenni Jones.
852 reviews19 followers
November 9, 2016
I guess I only found this a little boring because I'm way too old for these books. But, come on! They're still really good. The art is amazing and the text pops. The plot is really good, there were twists not even I saw coming. I would've liked it better in 4th grade, but whatevs. Good series for the younger girls of this world.
Profile Image for Joan.
12 reviews6 followers
January 3, 2017
Adventurous. But too short. For me.
Profile Image for Pallavi Chutani.
13 reviews
May 5, 2021
The book is very imaginative, and it has a proper start and end. The friendship portrayed is rather inspirational, as always Thea never ceases to not take the heart of the reader away.
11 reviews1 follower
January 29, 2022
My kids love these books. This one and Geronimo Stilton. They are quick to read and not long chapters.
Profile Image for Sara Ríos.
Author 1 book3 followers
January 14, 2025
Libro para los pequeños muy bueno para la lectura. Engancha y no aburre.
Profile Image for Tasha Stoll-Juredine.
80 reviews
August 17, 2019
This was a fun book to read with my four year old daughter. She enjoyed the book so much that we got more Thea Stilton and Geronimo Stilton books from the library.
Profile Image for Stephanie.
166 reviews
August 30, 2017
My daughter and I read this aloud over the course of several nights. It was her first real chapter book that we enjoyed together and she loved it! We've recently picked up another from the library! This book has also helped her with her reading skills with the cleverly placed words in bright colored and fun fonts. Looking forward to our next one together.
Profile Image for Venkatesh Nagaraddi.
2 reviews
October 7, 2016
This was a story where you would truly dive in and get swept away.


Its very beautiful but very risky.I loved it so much. I think anyone who likes Thea Stilton would like this story.
Profile Image for Holly Bolton.
423 reviews
April 27, 2020
I just finished reading this book aloud with my daughter. So far we have read four of these Special Edition versions of the Thea Stilton series and my daughter has loved them all. She is 5 and loves the adventures that these novels take her on and has come to really love the characters. These books have inspired her to want to read more...every night I find her asking “mommy just one more chapter” which is truly what embodies a great novel! It is age appropriate for her and always leaves her wanting more, which in turn is fuelling her desire to read! I also enjoy the storyline and the adventures these mice encounter and love that their friendship always pulls them through whatever hardships they encounter. There are so many lessons in these books for children about putting others first and respecting the opinions and differences in others...finding that our unique abilities and differences are what make us who we are! We have a lot of good chats around the decisions the mice make throughout these stories and how each decision a person makes can leave an imprint on another person. Also the illustrations are beautifully done and the font changes seem to be very appealing to the reader...it’s something pretty unique to the Stilton collection and we both love it! Enjoy!
Profile Image for dhissamw.
66 reviews
December 7, 2021
Thea Stilton was what got me into reading in the first place. I have 16 Thea Stilton books. And i loved them all. I still love them, but i don't enjoy them as much as i used to. Because as i grow older, my interest in Young Adult Fantasy grows too. And i've been reading books by Leigh Bardugo or Victoria Aveyard. I think Thea Stilton will forever be my childhood favorite book. I love Paulina and Will, they're perfect for each other <3 (also i've read more than 16 books but i only have 16 of them in physical copies, the others i read in a library)(I apologize if there were misspellings or incorrect grammar, English isn't my first language and I am still learning something new everyday, so please tolerate me if there were mistakes)
10 reviews1 follower
July 29, 2019
I like this book a lot. The Thea Sisters determination, teamwork and friendship is very admirable. The book is about the amazing fantasy land Aquamarina, however the important and magic violin is stolen and their land is in danger. The Thea Sisters, together with Thea Stilten and Will Mystery must work together and save this land before it’s too late. When they are faced with dangerous situations, they still remain calm and solve the problems quickly.
10 reviews
October 20, 2020
SPOILER ALERT!!!
Who was your favorite character (and why)?
A. Probably Nicky, Because she is sooo funny and sometimes serious.
What surprised you?
A. That they got sucked into a whale.
Would you change the ending? Why/why not?
A. No because it was fun and they looked sooooo beautiful.




By Reine.
Profile Image for Skyler Mendoza.
17 reviews2 followers
March 2, 2023
The Treasure Of The Sea is even better than a mouse's favorite cheese! Its storyline is intense with a mysterious mystery! And of course, by doing so, this author made me read it finish in two days.

Well, I'me off to reading again!

Your good heart won the day, in the end,” – Thea Stilton, page 300 hardcover copy.


Profile Image for noah ౨ৎ.
7 reviews
August 6, 2023
The nostalgia I felt while reading this haha. I liked this type of stuff when I was a kid, which makes sense. It was fun and more thrilling than most books I read that age. Now I realize how bland it was and how they seemed to have no setbacks in the mission. I know this is for kids, but I think even at that age it would have been cool to have more plot twists. Great book, love it xx
Profile Image for Juju#Selfie.
9 reviews1 follower
May 5, 2017
it was good i really liked it!there were all kinds of sea creatures it was amazing there was the men herbit crab that was cursed queen anamone the queen of aquariama i loved it alot i suggest you read it!
Profile Image for M.Samritha.
26 reviews
September 13, 2020
This book was great and adventurous saving the realms of this under ground world but these books have a lot of errors which is really exciting to correct sometimes I find it simple short and crisp story but this series of novel is too young for me to read.
Regards
Book nerd
2 reviews
September 25, 2020
It's a great book

Love the book, highly recommended. You will love this book if you like drama,mystery and suspense. You will be amazed by the creativity used by the author for the fantasy characters.
Profile Image for Shylyne.
79 reviews
December 3, 2017
2.5
I used to really like these books. I still think that they're good, but I just wasn't able to get into it very easily. I have been in a little bit of a reading slump though...
9 reviews
May 7, 2018
it is olut of adventures
This entire review has been hidden because of spoilers.
31 reviews
May 14, 2018
There are the stories of sea. It was amazing I liked it.
1 review1 follower
November 26, 2018
This is very bad good reads as you are not letting the reader read the book
How fare is that
Profile Image for Cerise Heartfilia.
324 reviews2 followers
June 16, 2019
Beautiful 🤩🤩🤩🐬🐳🐟🐋🌊🌊🌊 I loved how this time they went underwater :3. It was great. We should have seen more mermaids but still it was a great book and story :3 🐭🐭
Displaying 1 - 30 of 77 reviews

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