Al Qaeda second in command Dr. Ayman Zawahiri is often referred to as the "brains of Al Qaeda". This book translates into English the writings of Zawahiri, as well as the post-September 11 communiques of the Egyptian physician turned terrorist. It includes a complete translation of his December 2001 book "Knights Under the Prophet's Banner". If you want to know what makes this Al Qaeda leader tick, this is the book to read.