If you’re still interested in this topic, I recommend Black Flags: The Rise of ISIS. https://www.amazon.com/dp/B00RRT346E/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1 The book is written by a reporter who follows the trajectory of ISIS through the story of al-Zarqawi. I found the narrative form easier to follow, though you’ll likely find overlap with this similarly named book above.
If you’re still interested in this topic, I recommend Black Flags: The Rise of ISIS. https://www.amazon.com/dp/B00RRT346E/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1 The book is written by a reporter who follows the trajectory of ISIS through the story of al-Zarqawi. I found the narrative form easier to follow, though you’ll likely find overlap with this similarly named book above.