February 2017, Pakistani paramilitary soldiers stand alert at a checkpost on the Afghan border at Chaman | Dawn file photo It’s not easy to write a book about America’s failed war in Afghanistan. By now, most facts, developments and inflection points have already been written about and discussed since the United States-led invasion in 2001. In the coming years, as more information surfaces and documents get declassified, we might get books that offer new material. But at present, it’s difficult to hold a reader’s interest, especially one who is not new to the subject. Zahid Hussain...