I have never forgotten our first encounter. We knew each other then only as fellow-lodgers whose rooms were adjoining ones. Then one evening I came home from business and to my astonishment found Haller seated on the landing between the first and second floors. He was sitting on the top step and he moved to one side to let me pass. I asked him if he was all right and offered to take him up to the top.

Haller looked at me and I could see that I had awoken him from a kind of trance. Slowly he began to smile his delightful sad smile that has so often filled my heart with pity. Then he invited me to sit beside him. I thanked him, but said it was not my custom to sit on the stairs at other people’s doors.

“Ah, yes,” he said, and smiled the more. “You’re quite right. But wait a moment, for I really must tell you what it was made me sit here for a bit.”