An explosion in the heart of Paris launches a French-American investigation that propels Doyle O’Gara, a computer scientist at a technology supplier to the CIA, from the periphery of the war on terrorism into its moral nerve center and toward a disastrous miscalculation that transforms his life. As the suspense-filled investigation leaps from one surprising clue to the next, Doyle O’Gara hurtles toward a dilemma of conscience that defines him and the country he serves.