International Kindle Paperwhite
EUR 2.55
You will be charged USD 2.99

Promotions apply when you purchase

These promotions will be applied to this item:

Some promotions may be combined; others are not eligible to be combined with other offers. For details, please see the Terms & Conditions associated with these promotions.

Sold by Amazon.com Services LLC.
You've subscribed to ! We will preorder your items within 24 hours of when they become available. When new books are released, we'll charge your default payment method for the lowest price available during the pre-order period.
Update your device or payment method, cancel individual pre-orders or your subscription at
Your Memberships & Subscriptions

Buy for others

Give as a gift or purchase for a team or group.
Learn more

How it works

  1. Choose your delivery method
  2. Send now or schedule for later
  3. Add your personal message
  4. Recipients can read on any device

These ebooks can only be redeemed by recipients in the US. Redemption links and eBooks cannot be resold.

Added to

Sorry, there was a problem.

There was an error retrieving your Wish Lists. Please try again.

Sorry, there was a problem.

List unavailable.
Kindle app logo image

Download the free Kindle app and start reading Kindle books instantly on your smartphone, tablet, or computer - no Kindle device required.

Read instantly on your browser with Kindle for Web.

Using your mobile phone camera - scan the code below and download the Kindle app.

QR code to download the Kindle App

  • Undisciplined Catalyst (Coletti Warlord Series Book 19)

Follow the author

Get new release updates & improved recommendations
Gail Koger
Follow
Something went wrong. Please try your request again later.

Undisciplined Catalyst (Coletti Warlord Series Book 19) Kindle Edition

by Gail Koger (Author) Format: Kindle Edition
4.6 out of 5 stars (263)
I was sixteen when I found out not only am I an alien hybrid, but monsters called the Tai-Kok were getting ready to invade our world. Guess who gets to stop them? Me. How?

My uncle, the mad scientist, created a machine called the portal that instantaneously sends a test subject from one location to another by converting them into energy. His idea is to port me onto a Tai-Kok ship. All I have to do is leave a bomb, hit the retrieval button on my spiffy traveler’s belt and poof! I’m back on Earth before the Tai-Kok ship goes kaboom. Sounds simple, right?

Wrong. Uncle Ben doesn’t have a clue where I’ll actually appear on the ship. It could be the engine room, the crew quarters, or even the bridge. It’s like playing Russian roulette. The Tai-Kok don’t like surprises or uninvited guests.

To make things even more fun, I have an alien battle commander stuck in my head and I’m related to a powerful Coletti warlord. Yippee. The chances of me living to see eighteen aren’t good.
Read more
Previous slide of product details
  1. Book 17 of 17
    Coletti Warlord Series
  2. Print length
    121 pages
  3. Language
    English
  4. Accessibility
    Learn more
  5. Publication date
    November 22, 2025
  6. Reading age
    17 - 18 years
  7. File size
    2.9 MB
  8. Page Flip
    Enabled
  9. Word Wise
    Enabled
  10. Enhanced typesetting
    Enabled
Next slide of product details

Shop this series

 See full series
There are 17 books in this series.
  • Kindle Price:
    EUR 21.45
    -
    You will be charged $25.16
    By placing your order, you're purchasing a license to the content and you agree to the Kindle Store Terms of Use.

Why can't I get these titles?

Under state law, teens need a parent or guardian to buy or borrow titles. Ask your parent or guardian to acquire these titles for this account from their device. These books will appear in your Kindle library once they do.

Customers also bought or read

Page 1 of 1Start over
Previous page
  7. Book cover Alien Commander’s Lost Daughter, Kindle Unlimited
    Alien Commander’s Lost Daughter
    Just released
    Kindle Edition
    EUR3.40
  10. Book cover Shattered Stars
    Shattered Stars
    Kindle Edition
    EUR4.25
  11. Book cover Lionheart (Kinkaid Shifters Book 1)
    Lionheart (Kinkaid Shifters Book 1)
    Kindle Edition
    EUR5.11
  12. Book cover Shenanigans
    Shenanigans
    Kindle Edition
    EUR2.55
  14. Book cover Breakaway (Verdant String Book 1), Kindle Unlimited
    Breakaway (Verdant String Book 1)
    Kindle Edition
    EUR3.40
  16. Book cover Knight Fall (Knight Walker Book 1)
    Knight Fall (Knight Walker Book 1)
    Kindle Edition
    EUR3.40
  18. Book cover Grave Affairs
    Grave Affairs
    Kindle Edition
    EUR6.81
  20. Book cover The Shifter's Queen (More Than Human)
    The Shifter's Queen (More Than Human)
    Kindle Edition
    EUR2.55
  23. Book cover Storm Called: A Royal States Novel
    Storm Called: A Royal States Novel
    Kindle Edition
    EUR5.11
  24. Book cover Into the Dream (The Arcadians Book 1), Kindle Unlimited
    Into the Dream (The Arcadians Book 1)
    Kindle Edition
    EUR5.11
  25. Book cover Slavic, Kindle Unlimited
    Slavic
    Kindle Edition
    EUR2.55
  27. Book cover Dark Heart’s Secret Baby, Kindle Unlimited
    Dark Heart’s Secret Baby
    Kindle Edition
    EUR3.40
  28. Book cover The Beast's Bride
    The Beast's Bride
    Just released
    Kindle Edition
    EUR4.25
Next page
Loading...

Product details

  • ASIN ‏ : ‎ B0G3D5M4L5
  • Accessibility ‏ : ‎ Learn more
  • Publication date ‏ : ‎ November 22, 2025
  • Language ‏ : ‎ English
  • File size ‏ : ‎ 2.9 MB
  • Screen Reader ‏ : ‎ Supported
  • Enhanced typesetting ‏ : ‎ Enabled
  • X-Ray ‏ : ‎ Not Enabled
  • Word Wise ‏ : ‎ Enabled
  • Print length ‏ : ‎ 121 pages
  • Page Flip ‏ : ‎ Enabled
  • Book 17 of 17 ‏ : ‎ Coletti Warlord Series
  • Reading age ‏ : ‎ 17 - 18 years
  • Best Sellers Rank: #461,954 in Kindle Store (See Top 100 in Kindle Store)
  • Customer Reviews:
    4.6 out of 5 stars (263)

About the author

Follow authors to get new release updates, plus improved recommendations.
Gail Koger

Gail Koger

Brief content visible, double tap to read full content.
Full content visible, double tap to read brief content.

I was a 9-1-1 dispatcher and to keep insanity at bay, I took up writing. Not to worry. The insanity isn't catching - much. Other than the addiction to chocolate and the twitch in my left eye, I'm good.

Gail Koger's website: www.gailkoger.com

Goodreads: http://www.goodreads.com/author/show/1598719.Gail_Koger

Facebook: https://www.facebook.com/Colettiwarlordbooks/

LR Cafe nominated Courting Mayhem for Best Science Fiction of 2021!!

Defying the Relic Hunter made Delighted Reader's THE TOP TEN MOST ANTICIPATED BOOKS FOR 2020!!

Hothar's Folly won The TBR Pile’s BOOK OF THE YEAR 2019.

Wulf and the Bounty Hunter won LRC Best in Science Fiction 2016

Game on Askole was Night Owl’s TOP PICK – 4 ½ stars

Crossing Quinn won LRC Best in Science Fiction 2017

Catching Dragos won Readers Choice Award at TRR 2016

Customer reviews

4.6 out of 5 stars
263 global ratings

Top reviews from the United States

  • JudyfromCA
    5.0 out of 5 stars I cannot recommend this series high enough! Go read them! Worth every penny you spend!
    Reviewed in the United States on December 10, 2025
    Format: KindleVerified Purchase
    I absolutely adore this series of books by Gail Koger. This latest one doesn't disappoint.

    Lexi (like all of Gail's female lead characters) is strong, vibrant and relatable. Lexi is a teen in this book (which I thought might be weird reading but it wasn't!). I love the snark and sass Lexi gives her family and the Coletti warlord Kaelen.

    This series is a great series to read - great dialogue, characters you can relate to - even though it's totally sci-fi and kick @ss. Gail keeps each story action packed and it is easy to dive in from page 1 and be hooked until the end.

    Along with the characters, story and descriptions - there is plenty of humor and of course romance along the way.

    I am sad that the Colletti series "may" be coming to an end (have there been 19 already?! I was just having fun!) But I love the teaser at the end of the book indicating a possible spin off series with "COPS".

    I cannot recommend this series high enough! Go read them! Worth every penny you spend!
    2 people found this helpful
    Helpful
     Report
  • CRZ
    5.0 out of 5 stars Fun Read!
    Reviewed in the United States on January 27, 2026
    Format: KindleVerified Purchase
    I adore the Coletti Warlord series. This latest book does not disappoint. I could not put it down until I finished. I look forward to the COPS series. It looks like it will be a fun read too! I highly, highly recommend reading the Coletti Warlord series. Be ready to laugh until you cry. They are that good.
    One person found this helpful
    Helpful
     Report
  • Kindle Customer
    4.0 out of 5 stars Good read
    Reviewed in the United States on February 14, 2026
    Format: KindleVerified Purchase
    I enjoyed reading this book 📖
    I've got too much time on my hands!!! I read this book in one day!! And now I'll be impatiently waiting for the next book. Is this a spin-off??? Am I going to have to look for a new series about the same races, in same universe??? I hope any interaction with characters from the Coletti Warlord series stay within the timeline and character personalities from Coletti Warlord series. That can get complicated since this story was kind of like a prequel to the Coletti Warlord series.
    Anyway good story! In keeping with established behaviors people and races from previous books in the series. I'm still looking forward to The Feral's Beast! Hope it comes out soon!!!
    One person found this helpful
    Helpful
     Report
  • Linda
    5.0 out of 5 stars Catalyst and Her Mate.
    Reviewed in the United States on November 25, 2025
    Format: KindleVerified Purchase
    Great reading. Good storyline is unpredictable and yet easy to follow... makes sense. Character's actions, thought processes, interactions, and environmental scenes well fleshed out and interesting. This book fills in some interesting bits and pieces of previous books. Good lead into the next book. Think worth the purchase price as well as well as a revisit. Hopefully, if purchased or borrowed, enjoy the book as much as I have.
    One person found this helpful
    Helpful
     Report
  • GSKM in sc
    5.0 out of 5 stars outstanding
    Reviewed in the United States on November 22, 2025
    Format: KindleVerified Purchase
    It was such an enjoyable read. I found out it was published by accident and I am so glad I saw it. I liked the way the female lead was from the head Colletti bloodline. Lots of action, humor and action. Looking forward to the space police books. I adore the Colletti Warlord series.
    One person found this helpful
    Helpful
     Report
  • m.
    5.0 out of 5 stars Colette warlord series
    Reviewed in the United States on December 8, 2025
    Format: KindleVerified Purchase
    I love the Colette warlord series!! I have been following sense the first book and got hooked. Looking forward to more books by Gail Koger
    Helpful
     Report
  • Chris
    5.0 out of 5 stars Coletti Warlords rule
    Reviewed in the United States on December 9, 2025
    Format: KindleVerified Purchase
    Another great read from Gail Koger. Cannot wait to see where she is going with cops in space!!!! The whole series is fantastic.
    One person found this helpful
    Helpful
     Report
  • Suzanne B. Rothchild
    5.0 out of 5 stars a rollicking good read
    Reviewed in the United States on November 27, 2025
    Format: KindleVerified Purchase
    the Coletti world intersects with Earth pre Kaylee and her mate's meet-up, before Zarek found Earth.... but not before the Tai-kok found Earth. The start of a new off shoot of the Coletti world. Let the hijinx begin
    One person found this helpful
    Helpful
     Report

Top reviews from other countries

  • Dar
    5.0 out of 5 stars chais and fun
    Reviewed in Canada on January 16, 2026
    Format: KindleVerified Purchase
    Another great book, and I believe a new start for the Coletti series. Can’t wait for the next one. Ms. Kroger’s books are an automatic buy for me. I highly re ommend.
    Report
  • susanh
    5.0 out of 5 stars Good read
    Reviewed in the United Kingdom on December 9, 2025
    Format: KindleVerified Purchase
    Wrong kindle, couldn't put it down, it took me a couple of hours.
    Good read still mayhem and chaos, can't wait for the next one.
    Report
  • Kindle Customer
    5.0 out of 5 stars Another great Read.
    Reviewed in Australia on February 19, 2026
    Format: KindleVerified Purchase
    I love this series and wait each new one with great anticipation. I enjoy reading about the heroes from previous books and each book is very well written
    Report
  • Andrea Mitchell
    5.0 out of 5 stars fun
    Reviewed in Canada on November 29, 2025
    Format: KindleVerified Purchase
    Fun, light hearted read. Gail goes back to before the war with the Tai Kok and explains how it started, a great new adventure and it looks like a whole new series is going to start.
    Report
  • yvonne sims
    5.0 out of 5 stars Loved it
    Reviewed in the United Kingdom on December 9, 2025
    Format: KindleVerified Purchase
    Anyone thinking of reading books by this author need not hesitate just buy your first book and you will be hooked
    Report
See more reviews

Report an issue


Does this item contain inappropriate content?
Report
Do you believe that this item violates a copyright?
Report
Does this item contain quality or formatting issues?
Report