Book 7 in the Shadow Strike series.
"For David Rivers and his team, the mission was supposed to be simple—retrieve a defecting militia leader and deliver him to CIA interrogators. But nothing is simple in Yemen, where vast swaths of terrain are controlled by Houthi and Al Qaeda fighters. When they locate the asset, the team discovers why he has been deemed critical to their intelligence effort. The defector has direct knowledge of the team’s top target: Erik Weisz, the shadowy figurehead behind the most catastrophic terrorist attacks since 9/11. And as it turns out, Weisz is currently in Yemen, traveling through Houthi territory with heavy security."