One failure of 9/11 that has not received the attention it deserves is the inadequacy of the U.S. and international network of financial transparency reporting requirements to detect terrorist finance. In Hide and Seek, John A. Cassara, an expert in the fields of terrorist financing and money laundering, provides personal insight into the workings of the intelligence and law enforcement communities. He contends that the mistakes made by many different agencies before 9/11 were not isolated. Rather, he says these blunders were a result of bureaucratic cultures, misguided policies, and...