Silent Target. The Aaron Holt Series, #4

A weapon of mass destruction. A rising terrorist threat. One agent to stop them all. While Theo Florakis remains elusive, Aaron Holt is tasked with a new mission. A newly formed Irish extremist cell has vanished underground-taking with them enough firepower to level city blocks and ignite political chaos. With no trail, no leads, and zero room for error, Holt is thrust into a deadly hunt through the shadows of Europe.
His mission: locate the group, dismantle their operation, and neutralize the threat-before the first bomb goes off.