“I’m perfectly aware of that,” was my reply. “But there is no more dangerous criminal than the medical man who is beneath the thumb of a millionaire. There have been several before the assizes in various cities of Europe. Many, thanks alas! to the power of gold, have never been unmasked. There have been cases in Hungary, in France, in Italy, and in Russia—even one case in England which is recorded in a big file at Scotland Yard. But in that case there was no prosecution because money means influence, and influence means the breaking of those in office who dare to oppose it.”

“Then how do you suggest that I should act, Mr. Garfield?” asked young Mrs. Cullerton. “It is distressing news to me that Mr. De Gex is my enemy—and I confess that at present I can scarcely credit it.”

I longed to unbosom myself to her—to tell her of all that had occurred to me since that fateful November night when I had passed through Stretton Street, but I was not yet fully confident concerning her attitude towards me. It might be hostile. She might seek De Gex when he returned from Algiers and tell him of our interview! If she did, then all hope of elucidating the mystery of Gabrielle Engledue’s death would be at once swept away.

Yet I held before me the fact that the millionaire, hand-in-glove with that scoundrelly Italian, intended to cast me into my grave. The Italians have all through the centuries been experts in secret assassination. The Doges of Venice, the Borgias, and the Medici have all had secret poisoners in their pay. The gay, careless race which laughs when the sun shines, are just the same to-day, after the war, as they were in the days of His Holiness Rodrigo Borgia. To-day your superstitious Italian criminal enters the church and prays to the Madonna that his coup—whatever it may be, from profiteering, picking pockets, or the secret assassination of an enemy—may be successful.

“I allege that Mr. De Gex is your enemy, Mrs. Cullerton,” I said. “I have first-hand knowledge of it. Indeed, on the night of the ball at the Villa Clementini, he had in his pocket the wherewithal to bring upon you an illness which must inevitably prove fatal. He had a little glass tube which he had ordered Moroni to prepare, but which the doctor himself urged him not to break for fear of infecting himself and his family.”

She sat staring at me open-mouthed.

“I—I really can’t believe it!” she gasped. “Mr. De Gex would never act in such a dastardly manner towards me. We are friends—old friends.”

“You may be, but I happen to know the truth,” I declared. “He pretends friendship towards you, but his intentions are that your lips shall be closed. For some reason he fears you.”

“Are you really quite serious?” she asked, looking me full in the face.