You do a really great job of maintaining the tone of the first half. Instead of addressing the details of the letter, you sidestep, and instead create an equally enthralling story that does the first half justice, a real skill indeed. The exchange with the receptionist is so good, and the way you play on some of the other elements from the first half, the fleas, the employer, and how brilliantly you pick up the main character, a wonderful ending!