“I am unable to argue the point,” replied Trent. “Fair science may have smiled upon the liver-fluke’s humble birth, but I never even heard it mentioned.” “It is not, perhaps, an appetizing subject,” said Mr. Cupples thoughtfully, “and I will not pursue it. All I mean is, my dear Trent, that there are really remarkable things going on all round us if we will only see them; and we do our perceptions no credit in regarding as remarkable only those affairs which are surrounded with an accumulation of sensational detail.” Trent applauded heartily with his knife-handle on the table, as Mr. Cupples ceased and refreshed himself with milk and soda water. “I have not heard you go on like this for years,” he said. “I believe you must be almost as much above yourself as I am. It is a bad case of the unrest which men miscall delight. But much as I enjoy it, I am not going to sit still and hear the Manderson affair dismissed as commonplace. You may say what you like, but the idea of impersonating Manderson in those circumstances was an extraordinarily ingenious idea.” “Ingenious—certainly!” replied Mr. Cupples. “Extraordinarily so—no! In those circumstances (your own words) it was really not strange that it should occur to a clever man. It lay almost on the surface of the situation. Marlowe was famous for his imitation of Manderson’s voice; he had a talent for acting; he had a chess-player’s mind; he knew the ways of the establishment intimately. I grant you that the idea was brilliantly carried out; but everything favoured it. As for the essential idea, I do not place it, as regards ingenuity, in the same class with, for example, the idea of utilizing the force of recoil in a discharged firearm to actuate the mechanism of ejecting and reloading. I do, however, admit, as I did at the outset, that in respect of details the case had unusual features. It developed a high degree of complexity.” “Did it really strike you in that way?” enquired Trent with desperate sarcasm. “The affair became complicated,” went on Mr. Cupples unmoved, “because after Marlowe’s suspicions were awakened, a second subtle mind came in to interfere with the plans of the first. That sort of duel often happens in business and politics, but less frequently, I imagine, in the world of crime.”