It was five o'clock in the afternoon. There can be no doubt whatever as to that. Old Agnes may say what she pleases-she has a habit of doing so-but I know for certain (because I looked at my watch not ten minutes before it happened) that it was exactly five o'clock in the afternoon when I received a most singular and every way remarkable visit-a visit which has left an indelible impression on my memory, as well it might; for, independent of its singularity and unexpectedness, one of its results was the series of strange adventures which are faithfully detailed in this volume. It happened thus:- I was seated in an armchair in my private study in a small town on the west coast of England. It was a splendid afternoon, and it was exactly five o'clock. Mark that. Not that there is anything singular about the mere fact, neither is it in any way mixed up with the thread of this tale; but old Agnes is very obstinate-singularly positive-and I have a special desire that she should see it in print, that I have not given in on that point.