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The Secrets of Droon #25

The Riddle of Zorfendorf Castle

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With nearly 2 million books in print, this Little Apple series is H-O-T, hot. The SECRET is out -- DROON is the series that kids, parents, and teachers are talking about!

There's only one passage between the Upper World and Droon -- the magical rainbow staircase. At least, that's what Eric and his friends have always believed. But now Ko and his beasts are attacking Zorfendorf Castle, a magical fortress that's hiding a huge secret: the Fifth River, another passage to the Upper World. Ko will do anything to get to the river -- and to the Upper World. And Eric, Julie, Neal, and Keeah will do anything to stop him!

132 pages, Kindle Edition

First published January 1, 2005

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About the author

Tony Abbott

210 books408 followers
Tony Abbott (born 1952) is an American author of children's books. His most popular work is the book series The Secrets of Droon, which includes over 40 books. He has sold over 12 million copies of his books and they have been translated into several other languages, including Italian, Spanish, Korean, French, Japanese, Polish, Turkish, and Russian. He has also written the bestseller Firegirl.

Abbott was born in Cleveland, Ohio, in 1952. His father was a university professor and had an extensive library of books which became one of Abbott's first sources of literature. When he was eight years old, his family moved to Connecticut where he went through elementary school and high school.

Abbott attended the University of Connecticut, and after studying both music and psychology, decided to study English and graduated from the University of Connecticut with a bachelor's degree in English literature. He attended the workshops of Patricia Reilly Giff to further develop his writing after college.

Abbott currently lives in Trumbull, Connecticut, with his wife, two daughters, and two dogs. Tony had one brother and two sisters.

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5 stars
256 (41%)
4 stars
160 (26%)
3 stars
148 (24%)
2 stars
36 (5%)
1 star
13 (2%)
Displaying 1 - 21 of 21 reviews
Profile Image for Kryssy.
857 reviews4 followers
September 13, 2024
OUCH, this one hurt my challenge…

I really couldn’t get into the plot until the second half. This book was more of one to set up a bunch of plots for later books

- Friends are at the beach. Eric uses his powers and is seen by Meredith
- Need to find ko’s flying saucer palace
- Zorfendorf is the massive library
- Gethwing doesn’t want to go back to ko
- Message from galen in a book
- Galen created zorfendorf to hide a river made everyone think it was always there. Except ko who has been asleep…
- Fountain with old language carved on it
- Eric knew the symbol of the magic word. The fifth fountain goes straight up. To the upper world?
- Boat brought them up the river. Had to hide khan and max from (of all people) meredith. Go back to droon via basement
- Ring and medallian combine to tell a story. Zara build the fifth river to send sparr back
- Ko knows about a secret passageway. Sparr told him!
- Sparr can get in ko’s head to slow him down
- Used the medallion to shut down the fountain. Get sent back to when zara created it
- Sparr and gethwing escape to the upper world
- Lots of friends coming to fight dragon
- Stairs disappear before they can go home
This entire review has been hidden because of spoilers.
1,234 reviews
March 18, 2019
I love how the author continues to explore the past of Droon and of Sparr. I love how Sparr has always been the bad guy, but now he’s getting a second chance to make his life different. And I love the fun, adventurous story line.
Profile Image for Kylie Abecca.
Author 9 books43 followers
January 2, 2020
While the story was fast paced, it was often confusing, with very little progressive detail and characters introduced without explanation or context. I’m not sure if it’s because this is the first I’ve read in the series, but I found myself feeling quite lost and confused with this book.
Profile Image for Jessica.
5,417 reviews7 followers
October 9, 2025
Eric, Neal, Julie, Keeah, and Kid Sparr learning a shocking truth about Zorfendorf Castle as they try to thwart the plans of Ko and Gethwing. Another fantastic adventure.
Profile Image for Jeremy.
170 reviews10 followers
December 28, 2014
I've decided to read The Secrets of Droon series entirely for Christmas since i've been feeling a bit nostalgic. I want to be able to live a bit of the magic of being a kid and what beeter to help than this incredible series. I know that this series is for young kids but i feel it will still be great after all these years.
When I first read this series, this is the book that I started from, this was the start of my adventure with Droon. This was incredible. We get action, adventure, character development, mysteries, answers, friendship and much more. We find out a lot about Droon and Sparr's family and history and we are left with a big cliffhanger, making us want to read the next book badly. This one is one of the better books in the series.
Profile Image for Aaliyah.
6 reviews
March 15, 2013
I rate this book 3 stars because sometime its entertaining and sometimes its boring. When I saw the title of the book I thought it was "The Riddle Of Zorfendork Castle". Almost every time I saw the word Zorfendorf I read it as Zorfendork. This is the 2nd book i read of secret of droon. My favorite part is when they said that the castle of Sparr is hundred feet tall. My favorite character is Julie because she can change to any shapes. I recommend this book for people who likes fantasy and cool things that are happening.
Profile Image for Dylan  Wong S1.
3 reviews
March 31, 2008
This book is brilliant but u will understand nothing if you had not read the last 24 books! This took place mainly in zorfendorf castle, they had to solved a great single riddle to solved many branches os trouble. Sparr evil fin-headed monster now becomes a great young man and a helper to the tree to defeat Ko the legendary monster of doom and his pet dragon Gethwing.read to find out whether will the four or Ko win!!
Profile Image for Sue.
166 reviews9 followers
February 8, 2008
Read this because my son had to do a book talk and diorama on it. Only way to help him was to know what the book was about. He's 8 and loves this fun adventure series.
Profile Image for LMA Reads.
18 reviews3 followers
Read
March 4, 2008
They find the fith river that leds to the Upper world they to to destroy it before Emper Ko finds it and destroys the place it leds to
Profile Image for M C.
7 reviews
May 8, 2014
It was fine! I liked it also I didn't know Sparr can cry like that !! The secret they discovered about his mother was interesting !
Profile Image for Sydney.
1,117 reviews15 followers
November 15, 2013
i liked the part when they discovered the secret of little sparr's mother.
Displaying 1 - 21 of 21 reviews