In front of each of the couple of dozen houses of which the Terrace is composed lies a little square of railinged garden, in which you may often see the middle-aged or elderly mistress of the residence horticulturally employed. By five o’clock of a winter’s evening the pavements will generally be empty of all passengers except the policeman, who with felted step, at intervals throughout the night, peers with his bull’s-eye into these small front gardens, and never finds anything more suspicious there than an early crocus or an aconite. For by the time it is dark the inhabitants of the Terrace have got themselves home, where behind drawn curtains and bolted shutters they will pass a domestic and uninterrupted evening. No funeral (up to the time I speak of) had I ever seen leave the Terrace, no marriage party had strewed its pavements with confetti, and perambulators were unknown. It and its inhabitants seemed to be quietly mellowing like bottles of sound wine. No doubt there was stored within them the sunshine and summer of youth long past, and now, dozing in a cool place, they waited for the turn of the key in the cellar door, and the entry of one who would draw them forth and see what they were worth. Yet, after the time of which I shall now speak, I have never passed down its pavement without wondering whether each house, so seemingly-tranquil, is not, like some dynamo, softly and smoothly bringing into being vast and terrible forces, such as those I once saw at work in the last house at the upper end of the Terrace, the quietest, you would have said, of all the row. Had you observed it with continuous scrutiny, for all the length of a summer day, it is quite possible that you might have only seen issue from it in the morning an elderly woman whom you would have rightly conjectured to be the housekeeper, with her basket for marketing on her arm, who returned an hour later. Except for her the entire day might often pass without there being either ingress or egress from the door. Occasionally a middle-aged man, lean and wiry, came swiftly down the pavement, but his exit was by no means a daily occurrence, and indeed when he did emerge, he broke the almost universal usage of the Terrace, for his appearances took place, when such there were, between nine and ten in the evening. At that hour sometimes he would come round to my house in Newsome Square to see if I was at home and inclined for a talk a little later on. For the sake of air and exercise he would then have an hour’s tramp through the lit and noisy streets, and return about ten, still pale and unflushed, for one of those talks which grew to have an absorbing fascination for me. More rarely through the telephone I proposed that I should drop in on him: this I did not often do, since I found that if he did not come out himself, it implied that he was busy with some investigation, and though he made me welcome, I could easily