It was hard to believe that even the daring American cracksman should have ventured to touch that blood-stained relic of the Prophet, that he should have snatched it away from beneath the very eyes of the fanatics who fiercely guarded it.  What he hoped to gain by his possession of the slipper was not evident, but the fact remained that if he could be believed, he had it, and provided Scotland Yard’s information was accurate, he still lurked in hiding somewhere in London.

Meanwhile, no clue offered to his hiding-place, and despite the ceaseless vigilance of the men acting under Bristol’s orders, no trace could be found of Hassan of Aleppo nor of his fiendish associates.

“My theory is,” said Bristol, lighting a cigarette, “that even Dexter’s cleverness has failed to save him.  He’s probably a dead man by now, which accounts for our failing to find him; and Hassan of Aleppo has recovered the slipper and returned to the East, taking his gruesome company with him—­God knows how!  But that accounts for our failing to find him.”

I stood up rather wearily.  Although poor Deeping had appointed me legal guardian of the relic, and although I could render but a poor account of my stewardship, let me confess that I was anxious to take that comforting theory to my bosom.  I would have given much to have known beyond any possibility of doubt that the accursed slipper and its blood-lustful guardian were far away from England.  Had I known so much, life would again have had something to offer me besides ceaseless fear, endless watchings.  I could have slept again, perhaps; without awaking, clammy, peering into every shadow, listening, nerves atwitch to each slightest sound disturbing the night; without groping beneath the pillow for my revolver.

“Then you think,” I said, “that the English phase of the slipper’s history is closed?  You think that Dexter, minus his right hand, has eluded British law—­that Hassan and Company have evaded retribution?”

“I do!” said Bristol grimly, “and although that means the biggest failure in my professional career, I am glad—­damned glad!”

Shortly afterward he took his departure; and I leaned from the window, watching him pass along the court below and out under the arch into Fleet Street.  He was a man whose opinions I valued, and in all sincerity I prayed now that he might be right; that the surcease of horror which we had recently experienced after the ghastly tragedies which had clustered thick about the haunted slipper, might mean what he surmised it to mean.

The heat to-night was very oppressive.  A sort of steaming mist seemed to rise from the court, and no cooling breeze entered my opened windows.  The clamour of the traffic in Fleet Street came to me but remotely.  Big Ben began to strike midnight.  So far as I could see, residents on the other stairs were all abed and a velvet shadow carpet lay unbroken across three parts of the court.  The sky was tropically perfect, cloudless, and jewelled lavishly.  Indeed, we were in the midst of an Indian summer; it seemed that the uncanny visitants had brought, together with an atmosphere of black Eastern deviltry, something, too, of the Eastern climate.