Relentless Souls Books in Order
Below you'll find the complete list of Relentless Souls books in publication order. This is generally the recommended reading order for the series.
Reading order verified: January 2026
Publication Order
Relentless Souls
Buy on Amazon2018
Heart of Defiance
Buy on Amazon2019
Their Spirit Unbroken
Buy on Amazon2019
Frequently Asked Questions
The recommended reading order for the Relentless Souls series is publication order: 1. Relentless Souls (2018), 2. Heart of Defiance (2019), 3. Their Spirit Unbroken (2019). This is generally the best way to experience the story as the author intended.
The Relentless Souls series by Ryan Kirk contains 3 books. The series began in 2018 and continues to be a popular choice for readers.
The Relentless Souls series is written by Ryan Kirk. You can find more books and series by this author on our website.
Reader Reviews
No reviews yet. Be the first to share your thoughts!
Be the first to leave a review!