about six o'clock
Such were the circumstances of the Park Lane Mystery , which were further complicated by entire absence of motive , since , as I have said , young Adair was not known to have any enemy , and no attempt had been made to remove the money or valuables in the room . All day I turned these facts over in my mind , endeavouring to hit upon some theory which could reconcile them all , and to find that line of least resistance which my poor friend had declared to be the starting-point of every investigation . I confess that I made little progress . In the evening I strolled across the Park , and found myself about six o'clock at the Oxford Street end of Park Lane . A group of loafers upon the pavements , all staring up at a particular window , directed me to the house which I had come to see . A tall , thin man with coloured glasses , whom I strongly suspected of being a plain-clothes detective , was pointing out some theory of his own , while the others crowded round to listen to what he said . I got as near him as I could , but his observations seemed to me to be absurd , so I withdrew again in some disgust .