How safe are we? What do we sacrifice to feel safe? And who pays the ultimate price? Two Pulitzer Prize–winning journalists examine one of the most sensitive post–9/11 national security investigations—a breathtaking race to prevent an al-Qaeda bomber from launching Osama bin Laden’s final attack on American soil. In Enemies Within, Matt Apuzzo and Adam Goldman lay bare the complex and often contradictory state of counterterrorism and intelligence in America through the pursuit of Najibullah Zazi, a terrorist bomber who trained under one of bin Laden’s most trusted deputies. Zazi and his coconspirators represented America’s greatest fear: a terrorist cell operating inside America. Apuzzo and Goldman lift the veil of secrecy to reveal the strengths and weaknesses of our counterterrorism measures. This real-life spy story—uncovered in previously unpublished secret NYPD documents and interviews with intelligence sources—shows that while many of these programs are more invasive than ever, they are often counterproductive at best. After 9/11, New York Police Commissioner Ray Kelly initiated an audacious plan for the Big Apple: dispatch a vast network of plainclothes officers and paid informants—called “rakers” and “mosque crawlers”—into Muslim neighborhoods to infiltrate religious communities and eavesdrop on college campuses. Police amassed data on innocent people, often for their religious and political beliefs. But when it mattered most, these strategies failed to identify the most imminent threats. Enemies Within tackles the tough questions about the measures that we take to protect ourselves from real and perceived threats. Apuzzo and Goldman take readers inside America’s sprawling counterterrorism machine while it operates at full throttle. They reveal what works, what doesn’t, and what Americans have unknowingly given up.