The Riddle of the Mysterious Light

Mr. Narkom saw Cleek run to the tower's foot ... and then, almost immediately, he saw him throw up both hands and stagger backward.

There are days, even in the capricious climate of London, when the whole world seems at peace; when the blue of the summer sky, the fragrance of some distant flower brought in by a passing breeze, and the contented chirp of the birds, all unite to evoke a spirit of thankfulness for the very gift of life itself.
This was the spirit of Mr. Maverick Narkom, Superintendent of Scotland Yard, on this particular day in July. Even the very criminals had apparently betaken themselves to other haunts and distant climes, and the Yard, therefore, may be said to have been surprisingly slack. Up in his own private room, seated in front of his desk—both desk and room reduced to a state of order and tidiness uncanny to behold—sat the Superintendent, if the truth must be told, oblivious to all the world; a purple silk handkerchief draped itself gracefully over his head and rose softly up and down with the rise and fall of his breath. This was his last day at the Yard, for to-morrow would see him well on the road to Margate for a blessed two weeks' holiday with Mrs. Narkom and the children, not to mention guests who were nearly as precious to him, namely Ailsa Lorne and Hamilton Cleek.
His famous ally had himself been absent for more than two months, but was returning this very day—day, in fact, might be expected to arrive now at any minute, so it was little wonder that peace reigned supreme in the worthy Superintendent's heart, and induced his gentle slumbers even in the sacred precincts of what has been termed the Hub of London.
But outside, in the blue azure of the sky above, a tiny cloud, no bigger than that of the proverbial man's hand, had gathered, and as if it were a reflection of the storm-clouds of crime hovering round, there came the sharp ting-ting of the telephone bell at his elbow. For a minute, thus suddenly aroused, Mr. Narkom stared blankly at the disturber of his peace. A swift glance at the indicator told him it was a summons from the Chief Commissioner, and Mr. Narkom betook himself to the interview.