‘Black, two straps, very shabby – good. One day in the fairly near future – I cannot give a date – one of the messages among your morning’s work will contain a misprinted word, and you will have to ask for a repeat. On the following day you will go to work without your brief-case. At some time during the day, in the street, a man will touch you on the arm and say, "I think you have dropped your brief-case." The one he gives you will contain a copy of Goldstein’s book. You will return it within fourteen days.’