"But him—the man—Sir Gilbert, or whoever he is?" I whispered. "What of him, Mr. Lindsey?"
"Aye, just so!" he said. "I'm gradually piecing it together, as we go on. It would seem to me that he made his way to Edinburgh after getting rid of you, as he thought and hoped—probably got there the very next morning, through the help of yon fisherman at Largo, Robertson, who, of course, told us and the police a pack of lies!—and when he'd got the last of these securities from Paley, he worked back here, secretly, and with the help of Hollins, and has no doubt kept quiet in this old tower until they could get away with that gold! Of course, Hollins has been in at all this—but now—who's killed Hollins? And where's the chief party—the other man?"
"What?" I exclaimed. "You don't think he killed Hollins, then?"
"I should be a fool if I did, my lad," he answered. "Bethink yourself!—when all was cut and dried for their getting off, do you think he'd stick a knife in his confederate's throat? No!—I can see their plan, and it was a good one. Hollins would have run those cases down to Newcastle in a couple of hours; there'd have been no suspicion about them, and no questions which he couldn't answer—he'd have gone across to Hamburg with them himself. As for the man we know as Sir Gilbert, you'll be hearing something presently from Mr. Elphinstone yonder; but my impression is, as Maisie never saw or heard of him during the night and day, that he got away after his wife last night—and with those securities on him!"
"Then—who killed Hollins?" I said in sheer amazement. "Are there others in at all this?"
"You may well ask that, lad," he responded, shaking his head. "Indeed, though we're nearing it, I think we're not quite at the end of the lane, and there'll be a queer turning or two in it, yet, before we get out. But here's Murray come to an end of the present business."
Murray had finished his inspection of the cases and was helping Chisholm to replace the lids. He, Chisholm, and the detective were exchanging whispered remarks over this job; Mr. Elphinstone and Mr. Gavin Smeaton were talking together in low voices near the door. Presently Murray turned to us.
"We can do no more here, now, Mr. Lindsey," he said, "and I'm going to lock this place up until daylight and leave a man in the gateway below, on guard. But as to the next step—you haven't the least idea in your head, Moneylaws, about Hollins's assailant?" he went on, turning to me. "You heard and saw—nothing?"
"I've told you what I heard, Mr. Murray," I answered. "As to seeing anything, how could I? The thing happened on the stair there, and I was in this corner unlocking the inner door."
"It's as big a mystery as all the rest of it!" he muttered. "And it's just convincing me there's more behind all this than we think for. And one thing's certain—we can't search these grounds or the neighbourhood until the light comes. But we can go round to the house."