Sanders looked even more apologetic. "Well, there was an attempted robbery here about six months ago. Someone broke into your mailbox downstairs. There was nothing in it, of course; we've been putting everything into the vault as it came in. But the police thought it might be someone who knew you were getting money by mail. None of the other boxes were opened, you see, and--" He let his voice trail off as Turnbull began opening the tubes. None of them contained anything but correspondence. There was no sign of anything valuable. "Maybe they picked my box at random," Turnbull said. "They may have been frightened off after opening the one box." "That's very likely it," said Sanders. "The police said it seemed to be a rather amateurish job, although whoever did it certainly succeeded in neutralizing the alarms." Satisfied, the building superintendent exchanged a few more pleasantries with Turnbull and departed. Turnbull headed back toward the kitchen, picked up his glass of sherry, and sat down in the breakfast nook to read the letters. The one from Standard Recording had come just a few days after he'd left, thanking him for notifying them that he wanted to suspend his membership for a year. The three letters from Cairo, London, and Luna City were simply chatty little social notes, nothing more. The three from Scholar Duckworth were from a different breed of cat. The first was postmarked 21 August 2187, three months after Turnbull had left for Lobon. It was neatly addressed to Dave F. Turnbull, Ph.D. * * * * * Dear Dave (it read): I know I haven't been as consistent in keeping up with my old pupils as I ought to have been. For this, I can only beat my breast violently and mutter _mea culpa, mea culpa, mea maxima culpa_. I can't even plead that I was so immersed in my own work that I hadn't the time to write, because I'm busier right now than I've been for years, and I've had to _make_ time for this letter. Of course, in another way, this is strictly a business letter, and it does pertain to my work, so the time isn't as hard to find as it might be. But don't think I haven't been watching your work. I've read every one of your articles in the various journals, and I have copies of all four of your books nestled securely in my library. Columbia should be--and apparently is--proud to have a man of your ability on its staff. At the rate you've been going, it won't be long before you get an invitation from the Advanced Study Board to study for your Scholar's degree.