The recollection of that stick plunged Mallalieu into another of his ague-like fits of shaking and trembling. There was little sleep for him after that: he spent most of the night in thinking, anticipating, and scheming. That stick would almost certainly be found, and it would be found near Stoner's body. A casual passer-by would not recognize it, a moorland shepherd would not recognize it. But the Highmarket police, to whom it would be handed, would know it at once to be the Mayor's: it was one which Mallalieu carried almost every day--a plain, very stout oak staff. And the police would want to know how it came to be in that quarry. Curse it!--was ever anything so unfortunate!--however could he have so far lost his head as to forget it? He was half tempted to rise in the middle of the night and set out for the moors, to find it. But the night was dark, and solitary as the moors and the quarry where he dared not risk the taking of a lantern. And so he racked his brains in the effort to think of some means of explaining the presence of the stick. He hit on a notion at last--remembering suddenly that Stoner had carried neither stick nor umbrella. If the stick were found he would say that he had left it at the office on the Saturday, and that the clerk must have borrowed it. There was nothing unlikely in that: it was a good reason, it would explain why it came to be found near the body. Naturally, the police would believe the word of the Mayor: it would be a queer thing if they didn't, in Mallalieu's opinion. And therewith he tried to go to sleep, and made a miserable failure of it. As he lay tossing and groaning in his comfortable bed that night, Mallalieu thought over many things. How had Stoner acquired his information? Did anybody else know what Stoner knew? After much reflection he decided that nobody but Stoner did know. Further reckoning up of matters gave him a theory as to how Stoner had got to know. He saw it all--according to his own idea. Stoner had overheard the conversation between old Kitely and Cotherstone in the private office, of course! That was it--he wondered he had never thought of it before. Between the partners' private room and the outer office in which Stoner sat, there was a little window in the wall; it had been specially made so that papers could be passed from one room to the other. And, of course, on that afternoon it had probably been a little way open, as it often was, and Stoner had heard what passed between Cotherstone and his tenant. Being a deep chap, Stoner had kept the secret to himself until the reward was offered. Of course, his idea was blackmail--Mallalieu had no doubt about that. No--all things considered, he did not believe that Stoner had shared his knowledge--Stoner would be too well convinced of its value to share it with anybody. That conclusion comforted Mallalieu--once more he tried to sleep.