"What would you do if you were overseas and the world collapsed? How would you get home?" my real-life friend asked me. She and her husband were about to leave for Germany to spend Christmas with his family. Here is the story I wrote for them, of their journey home to the U.S. as the bottom fell out of the banking industry and nations went broke, rioting spread across Europe, and the world collapsed around them. By sea, air, and land they struggle...