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Age 9 and up | Grade 4 and up

The name's Chase Cooper, and this is my tenth diary as a 6th grade ninja. If I had a penny for every time trouble came knocking at my door... I'd have ten pennies. A few days have passed since the green ninja clan appeared, but that's more than enough time for them to give me a headache. It doesn't help that my attention is stretched between a crazy robotics competition, an annoying pirate poser, and the ex-leader of the red ninja clan. Somehow Wyatt and I have found ourselves on the same side of the fence this time, but we've made a deal - if I help him get his ninja clan back then he'll leave me alone forever. Now Wyatt and I are on a mission to figure out who the leaders of the new ninja clans are, but working with Wyatt definitely isn't easy. Whoever said "keep your friends close, but keep your enemies closer" obviously never met Wyatt.

Diary of a 6th Grade Ninja 10: My Worst Frenemy is an action packed adventure that's entertaining for children ages 9-12, middle school students, and adults.

172 pages, Kindle Edition

First published May 17, 2015

1836 people are currently reading
215 people want to read

About the author

Marcus Emerson

150 books295 followers
Marcus Emerson is the author of several highly imaginative children's books including the popular Diary of a 6th Grade Ninja series and the Secret Agent 6th Grader series. His goal is to create children's books that are engaging, funny, and inspirational for kids of all ages - even the adults who secretly never grew up. He is a 35-year-old comic book reader, video game player, and toy collector.

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5 stars
1,056 (82%)
4 stars
148 (11%)
3 stars
40 (3%)
2 stars
9 (<1%)
1 star
20 (1%)
Displaying 1 - 8 of 8 reviews
2 reviews
June 22, 2020
Ninjas!

When I found this book I was like, “YES a book about ninjas!”, then I realized that it was a series!!! My face: 😱🥳😃...or feelings...idk. I love all the books and the characters! I like how I can relate to some of the things that happened in these books. These books are amazing, just like the author! Keep up the grate work!
10 reviews2 followers
June 3, 2016
I loved this, it was a great book, keeping me on my seat the whole time, when chase cooper finds a very important guest at their school, it was a great book,

It made me cry when they kicked Hup-Hup, but when they got back on their feet, it surprised me, it gave me hope. I connect to when i made a robot and he didn't work and someone helped me with it. i predict that the green ninjas and red ninjas will split and it will cause a three way fight. this series is an amazing series and I recommend it to anyone who likes ninjas and is under 15.
This entire review has been hidden because of spoilers.
28 reviews3 followers
February 7, 2020
Gvczd

Th f2f v. Bc my. Vs. B. d f2f. F2f f g g f f. T t hate r e w a as e d d. D f f sweety d d d d d r r. e , the. I'm really not sure how much is a good 👍👍👍I you it would have to work on
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1,354 reviews13 followers
March 17, 2019
Goofy, silly... dumb... terrible grammar. Makes you laugh in embarrassment for the author, more than for any twist of the storyline.
2 reviews
June 29, 2020
Very nice book 😊😊😊👌👌👌👍👍👍😀

It is a very good book
I like everything in this book
A very good book 😁😊👌👍👍👌 nice 👍😀😊 good
19 reviews
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December 8, 2021
when he ends up having to team up with his worst enemy, he kept high suspension but it turned out the real enemy was Christmas
9 reviews2 followers
November 9, 2015
Wow great book I am 10 and I already know this is the best book in history!

Cool book. All about it is totes cool keep up the good work mister Marcus you are inspiring very many!
Profile Image for Jesse.
3 reviews1 follower
June 6, 2016
i liked this book because it had a ninja and other stuff
Displaying 1 - 8 of 8 reviews

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