The girl laughed at him, but she was interested nevertheless. For the moment they were on an intellectual level. He explained that the sign of the Cross was said to avert misfortune, and she imitated him clumsily. Llwellyn thought nothing of it at the time, but the meaningless travesty came back afterwards when he thought over that eventful night. Surely the holy sign of God's pain was never so degraded as now. Their conversation grew fitful and strained. The woman was physically tired by her work at the theatre, and the dark cloud of menace crept more rapidly into the man's brain. The hour grew late. At last Llwellyn rose to go. "You'll get the cash somehow, dear, won't you?" she said with tired eagerness. "Yes, yes, Gertie," he replied. "I suppose I can get it somehow. I'll get home now. If it's a clear night I shall walk home. I'm depressed--it's liver, I suppose--and I need exercise." "Have a drink before you go?" "No, I've had two, and I can't take spirits at this time." He went out with a perfunctory and uninterested kiss. She came to the archway with him. London was now quite silent in its most mysterious and curious hour. The streets were deserted, but brilliantly lit by the long row of lamps. They stood talking for a moment or two in the quadrangle. "Queer!" she said; "queer, isn't it, just now? I walked back from the Covent Garden ball once at this time. Makes you feel lonesome. Well, so long, Bob. I shall have a hot bath and go to bed." The Professor's feet echoed loudly on the flags as he approached the open space. Never had he seemed to hear the noises of his own progress so clearly before. It was disconcerting, and emphasised the fact of his sole movement in this lighted city of the dead. On the island in the centre of the cross-roads he suddenly caught sight of a tall policeman standing motionless under a lamp. The fellow seemed a figure of metal hypnotised by the silence. Llwellyn walked onwards, when, just as he was passing the Oxford Music Hall, he became conscious of quick footsteps behind him. He turned quickly, and a man came up. He was of middle size, with polite, watchful eyes and clean shaven. The stranger put his hand into the pocket of his neat, unobtrusive black overcoat and drew out a letter. "For you, sir," he said in calm, ordinary tones. The Professor stared at him in uncontrollable surprise and took the envelope, opening it under a lamp. This was the note. He recognised the handwriting at once. "HOTEL CECIL. "DEAR LLWELLYN,--Kindly excuse the suddenness of my request and come down to the Cecil with my valet. I have sent him to meet you. I want to settle our business to-night, and I am certain that we shall be able to make some satisfactory arrangement. I know you do not go to bed early.--Most sincerely yours, "CONSTANTINE SCHUABE."