Ah Tsong stared stupidly, whereupon Paul Harley addressed him in his native language, rapidly and in a low voice, in order, as I divined, that the Inspector should not hear him. “I feel dreadfully guilty, Knox,” he confessed, in a murmured aside. “For any Englishman, fictitious characters excepted, to possess a knowledge of Chinese is almost indecent.” Presently, then, I found myself once more in that unkempt garden of which I retained such unpleasant memories. Inspector Aylesbury stared all about and up at the back of the house, humming to himself and generally behaving as though he were alone. Before the little summer study he stood still, and: “Oh, I see,” he muttered. What he had seen was painfully evident. The right-hand window, beneath which there was a permanent wooden seat, commanded an unobstructed view of the Tudor garden in the grounds of Cray’s Folly. Clearly I could detect the speck of high-light upon the top of the sun-dial. The Inspector stepped into the hut. It contained a bookshelf upon which a number of books remained, a table and a chair, with some few other dilapidated appointments. I glanced at Harley and saw that he was staring as if hypnotized at the prospect in the valley below. I observed a constable on duty at the top of the steps which led down into the Tudor garden, but I could see nothing to account for Harley’s fixed regard, until: “Pardon me one moment, Inspector,” he muttered, brusquely. Brushing past the indignant Aylesbury, who was examining the contents of the shelves in the hut, he knelt upon the wooden seat and stared intently through the open window. “One-two-three-four-five-six-_seven_,” he chanted. “Good! That will settle it.” “Oh, I see,” said Inspector Aylesbury, standing strictly upright, his prominent eyes turned in the direction of the kneeling Harley. “One, two, three, four, and so on will settle it, eh? If you don’t mind me saying so, it was settled already.” “Yes?” replied Harley, standing up, and I saw that his eyes were very bright and that his face was slightly flushed. “You think the case is so simple as that?” “Simple?” exclaimed the Inspector. “It’s the most cunning thing that was ever planned, but I flatter myself that I have a good straight eye which can see a fairly long way.” “Excellent,” murmured Harley. “I congratulate you. Myopia is so common in the present generation. You have decided, of course, that the murder was committed by Ah Tsong?” Inspector Aylesbury’s eyes seemed to protrude extraordinarily. “Ah Tsong!” he exclaimed. “Ah Tsong!” “Surely it is palpable,” continued Harley, “that of the three people residing in the Guest House, Ah Tsong is the only one who could possibly have done the deed.” “Who could possibly--who could possibly----” stuttered the Inspector, then paused because of sheer lack of words.