Seven days after September 11, 2001, I left New York to do two weeks of book promotion, under other circumstances a predictable kind of trip. You fly into one city or another, you do half an hour on local NPR, you do a few minutes on drive-time radio, you do an "event," a talk or a reading or an onstage discussion. You sign books, you take questions from the audience. You go back to the hotel, order a club sandwich from room service, and leave a 5 AM call with the desk, so that in the morning you can go back to the airport and fly to the next city.