Early Warning, by Michael Walsh - book trailer

All Enemies Foreign And Domestic

The NSA's most lethal weapon is back. Code-named Devlin, he operates in the darkest recesses of the US government. When international cyber-terrorists allow a deadly and cunning band of radical insurgents to breach the highest levels of national security, Devlin must take down an enemy bent on destroying America—an enemy more violent and ruthless than the world has ever known.

"Michael Walsh is the new master of the political thriller. With the sophistication of Forsyth, the intrigue of le Carré, and the intensity of Ludlum, Early Warning is an incredible thriller. This book should be stamped Satisfaction Guaranteed! " -- Brad Thor, #1 New York Times bestselling author of Foreign Influence
(From the YouTube description)