David Baldacci’s bestselling series of thriller novels featuring John Puller, a gifted investigator with an unstoppable drive to find out the truth, begins with Zero Day. A combat veteran and special agent with the U.S. Army, Puller is the man they call to investigate the toughest crimes facing the nation, often with the help of intelligence operative Veronica Knox. In this action-packed series Puller faces criminal conspiracies, deadly state secrets and some perilous mysteries that hit dangerously close to home.