Down at the level of the roof two or three little beams of light marked the location of certain gargoyles or antique water-spouts, which Stanley had noticed on the outside, and marvelled that they should have been placed in the middle instead of the top of the tower. These explained the absence of water in the well.
Looking down, as his eyes became accustomed to the gloom, he was able to see something of the nature of the roof, which must enclose the secret chamber. It was covered with dust and debris, but he was positive he could distinguish certain little bumps or lumps, which he shrewdly guessed to be thick diamond panes of glass, set in lead, and which, as he conjectured, furnished light to the room beneath. Entrance to this apartment seemed totally lacking from the roof, or else concealed by the dust of centuries. No staircase could he discover on the inside of the well, and he was about to relegate it to the limbo of unfathomable mystery, when a startling discovery gave him the key to the whole matter. It was, he saw, manifestly impossible to go down inside without falling, after which, if not killed by the shock, he would be left to starve at his leisure, while his friends searched the country-side for him. But if to descend within was impossible, to descend without presented almost as many difficulties. To go over the battlements as he had come, was well-nigh hopeless; but if he could walk along their inner rim for a foot or two, round the next embrasure, to the natural slanting entrance which was directly over the first step, the descent would be, comparatively speaking, easy. To rise from his present posture and assume a standing position on the twelve-inch rim of a structure eighty feet in the air requires a steady head, and though the Secretary was possessed of this, he did not at all relish the undertaking. It had to be done, however; but after his previous experience he determined to take no more risks, and reaching out from his position of vantage, he tested carefully every step of the way. At last only the slanting step remained. Reaching far over he touched it with his hand, when, to his horror, it practically revolved, now pointing down into the interior of the tower, its outward end pointing up. He shuddered when he saw the fate which the fortunate accident to the stanchion had caused him to escape. Had he descended in the regular way and stepped upon the slanting plate, the instant his foot passed its centre of equilibrium, it would have revolved, and without a doubt flung him down into the interior of the well. It was a cursed, mediæval trick, a fitting accompaniment to the inquisitorial horrors of those ages—an English oubliette. If the fall did not finish the daring invader of the tower—the inhabitants of the secret chamber doubtless had means to insure his end, or perhaps he was merely left to starve.
Touching the plate once more he pushed it back to its original position, and found that it remained stationary. As long as he kept on the outward side he was safe, and if the Secretary observed this rule he could easily avail himself of the plate to descend by, for the perpetrators of the villainous arrangement had evidently not thought it necessary to make it entirely revolve, as one who had once gone up the tower was never expected to come down the outside again. And now, with great caution, he wormed his way to the treacherous step, and with still greater care placed his foot on its outer edge; it held firm, and he ventured to plant both his feet upon it. But, alas! he has forgotten how slippery a flag of slate, polished by two hundred years' exposure to the elements, may become. His feet slipped from under him, and in striving to save himself he overbalanced the stone. Instantly it revolved, and a second later he found himself suspended over the well, with only the strength of a despairing grasp on the edges of the slate between him and eternity.
CHAPTER XXXIII
THE SECRET OF THE DOOR
Miss Fitzgerald's disclosures to the Marchioness, as it turned out, rather helped than hindered those principally concerned, for Mr. Lambert met her Ladyship at the church, and his explanations took the keen edge off the wrath which she vented on her daughter a little later, and in the midst of which Lieutenant Kingsland arrived, with ample assurances of worldly prosperity, which overcame her strongest objections, and went far to reconcile her to the inevitable. Her disappointment, however, was keen, and her temper suffered in consequence, so that dinner, at which the Secretary's unaccountable absence formed the chief topic of conversation, was distinctly not a success, and the ladies retired early, leaving the gentlemen to their own devices.
Miss Fitzgerald claimed to join in the general hegira, but her actions belied her words, for shortly after she was supposed to have gone to her room, her figure, its white dinner dress concealed by a long grey cloak, might have been seen gliding across the lawn in the direction of the inn.
The night was pregnant with great events, though outwardly calm and beautiful, and the great hall in which Mr. Riddle, Kent-Lauriston, and the Lieutenant stood smoking, after having been dismissed from the drawing-room, was flooded with moonlight.
"I say," remarked Kingsland irrelevantly, after a long interval broken only by the conscientious puffing of cigarettes, "how that mediæval prize puzzle shows up in the moonlight."