Beneath all the public reasons for invading Iraq lies a secret war agenda that has paid off in the war on al-Qaeda, according to a leading intelligence analyst. Friedman's book, ``America's Secret War: Inside the Hidden Worldwide Struggle Between America and its Enemies,'' which goes on sale Tuesday, argues that midway through the war on terrorism, America has made major gains while al-Qaeda has failed in most of its goals and is on the defensive. Iraq, he argues, is a keystone of American strategy against al-Qaeda. ``Doing nothing would have been disastrous,'' Friedman said. Gains against al-Qaeda so far, he...