Without pausing in the task of cutting his mutton into very small pieces Mr. Cupples replied: “The most curious feature of it, in my judgement, was the irony of the situation. We both held the clue to that mad hatred of Manderson’s which Marlowe found so mysterious. We knew of his jealous obsession; which knowledge we withheld, as was very proper, if only in consideration of Mabel’s feelings. Marlowe will never know of what he was suspected by that person. Strange! Nearly all of us, I venture to think, move unconsciously among a network of opinions, often quite erroneous, which other people entertain about us. I remember, for instance, discovering quite by accident some years ago that a number of people of my acquaintance believed me to have been secretly received into the Church of Rome. This absurd fiction was based upon the fact, which in the eyes of many appeared conclusive, that I had expressed myself in talk as favouring the plan of a weekly abstinence from meat. Manderson’s belief in regard to his secretary probably rested upon a much slighter ground. It was Mr Bunner, I think you said, who told you of his rooted and apparently hereditary temper of suspicious jealousy.... With regard to Marlowe’s story, it appeared to me entirely straightforward, and not, in its essential features, especially remarkable, once we have admitted, as we surely must, that in the case of Manderson we have to deal with a more or less disordered mind.” Trent laughed loudly. “I confess,” he said, “that the affair struck me as a little unusual. “Only in the development of the details,” argued Mr. Cupples. “What is there abnormal in the essential facts? A madman conceives a crazy suspicion; he hatches a cunning plot against his fancied injurer; it involves his own destruction. Put thus, what is there that any man with the least knowledge of the ways of lunatics would call remarkable? Turn now to Marlowe’s proceedings. He finds himself in a perilous position from which, though he is innocent, telling the truth will not save him. Is that an unheard-of situation? He escapes by means of a bold and ingenious piece of deception. That seems to me a thing that might happen every day, and probably does so.” He attacked his now unrecognizable mutton. “I should like to know,” said Trent, after an alimentary pause in the conversation, “whether there is anything that ever happened on the face of the earth that you could not represent as quite ordinary and commonplace by such a line of argument as that.” A gentle smile illuminated Mr. Cupples’s face. “You must not suspect me of empty paradox,” he said. “My meaning will become clearer, perhaps, if I mention some things which do appear to me essentially remarkable. Let me see .... Well, I would call the life history of the liver-fluke, which we owe to the researches of Poulton, an essentially remarkable thing.”