It's no secret that federal agencies are waging a broad, global war against terror. But for the first time in this memoir, an active Muslim American federal agent reveals his experience infiltrating and bringing down a terror cell in North America.

A longtime undercover agent, Tamer Elnoury joined an elite counterterrorism unit after September 11. Its express purpose is to gain the trust of terrorists whose goals are to take out as many Americans in as public and as devastating a way possible....