CHAPTER 4 Professor De Grecis sipped his cappuccino as he looked, perplexed, at the clock placed on the table next to the tray. -Do you want anything else?- asked the waitress, politely, taking the cup away. -No, no, I'm waiting for a friend.- And sighing, he took the newspaper and opened it carefully, smoothing out the corners and getting ready to read. Finally the sound of the glass door opening roused him, and Claude appeared in front of him, panting, out of breath, with the air of someone who hadn't slept all night. -Teacher! Excuse me, excuse me, I'm crazy late, I was afraid I wouldn't find you anymore. I wanted to warn you but I didn't know how to do it, if only you could be persuaded to buy a cell phone, like everyone else ... -You know I'm against it, on principle. You could h