Ronald Kessler, an investigator reporter who has worked for the Wall Street Journal and Washington Post, researched deep within the FBI to produce one of the most thorough looks ever at the agency. Most of his findings focus on changes in the bureau since the days of autocratic director J. Edgar Hoover. He also shows how the FBI solved such cases as the World Trade Center bombing, covered up internal problems, and instituted many technological changes in criminal investigations.Kessler's research raised questions that played a role in the eventual removal from office of director William Sessions; events that reflect Kessler's investigative knowledge of the FBI.