It was impossible to misconceive the threat or to exaggerate the danger. The lad’s heart failed him. He stammered some excuses, counted out the sum, and saw his hateful visitors depart. No sooner were they gone than he hastened to confirm his doubts. By a dozen unquestionable marks he identified the girl he had jested with the day before. He saw, with horror, marks upon her body that might well betoken violence. A panic seized him, and he took refuge in his room. There he reflected at length over the discovery that he had made; considered soberly the bearing of Mr. K—’s instructions and the danger to himself of interference in so serious a business, and at last, in sore perplexity, determined to wait for the advice of his immediate superior, the class assistant. This was a young doctor, Wolfe Macfarlane, a high favourite among all the reckless students, clever, dissipated, and unscrupulous to the last degree. He had travelled and studied abroad. His manners were agreeable and a little forward. He was an authority on the stage, skilful on the ice or the links with skate or golf-club; he dressed with nice audacity, and, to put the finishing touch upon his glory, he kept a gig and a strong trotting-horse. With Fettes he was on terms of intimacy; indeed, their relative positions called for some community of life; and when subjects were scarce the pair would drive far into the country in Macfarlane’s gig, visit and desecrate some lonely graveyard, and return before dawn with their booty to the door of the dissecting-room. On that particular morning Macfarlane arrived somewhat earlier than his wont. Fettes heard him, and met him on the stairs, told him his story, and showed him the cause of his alarm. Macfarlane examined the marks on her body. ‘Yes,’ he said with a nod, ‘it looks fishy.’ ‘Well, what should I do?’ asked Fettes. ‘Do?’ repeated the other. ‘Do you want to do anything? Least said soonest mended, I should say.’ ‘Some one else might recognise her,’ objected Fettes. ‘She was as well known as the Castle Rock.’ ‘We’ll hope not,’ said Macfarlane, ‘and if anybody does—well, you didn’t, don’t you see, and there’s an end. The fact is, this has been going on too long. Stir up the mud, and you’ll get K— into the most unholy trouble; you’ll be in a shocking box yourself. So will I, if you come to that. I should like to know how any one of us would look, or what the devil we should have to say for ourselves, in any Christian witness-box. For me, you know there’s one thing certain—that, practically speaking, all our subjects have been murdered.’ ‘Macfarlane!’ cried Fettes. ‘Come now!’ sneered the other. ‘As if you hadn’t suspected it yourself!’ ‘Suspecting is one thing—’