H. M. set down the glass. He lumbered to the door, and turned only when he beckoned to Masters.

"It's a conjurin' trick," he said, "that I can't explain now. But I've got to do it. And my rubber spider's goin' to bite somebody, son, unless I'm very much mistaken. All I've got to tell you is that you'll let me down badly, and you'll do something that won't be pleasant for you to remember when you see the consequences, if you give a hint to anybody as to what's goin' on. Understand? Anybody. Come on, Masters. "

He opened the door. Mellow and deep through the house, but with something in its note at once of terror and finality, quivered the stroke of the dinner-gong.

CHAPTER EIGHTEEN

Gambits Replayed

"I think," said Maurice Bohun, slowly brushing one hand across the palm of the other, as though he were wiping a slate, "I think we are almost ready to proceed with the curious experiment Sir Henry has suggested?" He looked up from contemplating his hands. "I may say that it will not, of course, lead us to anything that concerns the actual murderer of Miss Tait. Although at Sir Henry's express wish I have refrained from telling all of you the fact that is, until such time as a certain gentleman shall be in a condition to defend himself — nevertheless we ourselves have little doubt. But. "

How Bennett got through that dinner he could never afterwards remember. Against his own inclination and even against his own will, something had compelled him to go to the King's Room before he went downstairs. He could not be content, with his mind full of troubled horrors as to what the thing might look like, until he had looked at it and curbed his imagination. Afterwards he wished he had not. It was a price. Inspector Potter stood guard at the door to the gallery: there were no lights on in the room, and only a sickly moonlight had begun to penetrate through the windows. But the door to, the secret staircase was open in a strong draught, and flashlights moved at the bottom where H. M. talked in low tones to Masters. He moved over to this door. He had not realized how high and steep and dangerous this staircase was: how the uneven stone steps, between narrow walls that smelled like a cellar, seemed to plunge down into a pit. Masters' light flashed up into his face so suddenly that he almost lost his balance. Then the beam turned down again on the other face, the face that was twisted back over one of the treads, and did not blink its eyes before the light.

Dinner, to which Bennett presently sat down with five others — H.M., Maurice, Willard, Katharine, and Louise was turned by Maurice into a hideous formality. Afterwards Bennett liked to forget it. Everybody except the host was conscious of a new strain, as though they felt without being told that death had come to the house again. When he went down to the library, he saw Louise for the first time since landing in England. She sat near the fire, wearing dark blue, with her mouse-colored hair flat and parted in the middle. In whatever cloudy mental picture he had already formed, he had always remembered her as short and thickset, her freckles predominating and her age as vaguely twenty-eight. He was surprised how thin she seemed now, her eyes dark-rimmed but surprisingly fine. Emotional strain had made a ghost of her, and yet a far from dowdy ghost. Her age might have been forty.

He mumbled a platitude or two. There was nothing to say, and he would not make the mistake of trying to say it. She smiled mechanically when she extended her hand; then clasped it about a handkerchief and stared into the fire, seeming to forget the rest of them. Maurice-burnished out in prim elegance-was very gracious, and extolled the sherry he offered them "to replace the detestable fashion of cocktails." His thin laugh rang under the roof. Jervis Willard was quiet and courteous, but he had begun to pace about the library with that caged stride of his, and you saw that he needed a shave. When H. M. lumbered in, blinking and mumbling amiably at everybody; Bennett thought that they all started a little. He could not tell whether the subject of the night's experiment had yet been mentioned. Katharine came down last of all. She was in plain black, without jewelry or ornament, but her shoulders gleamed against the dark panelling.

For Bennett, her presence suddenly intensified the terror that was on this group. She was reality, she was the warmth and beauty he knew; any of the others might have been goblins behind a mask, and one of them was. That was the evil uncertainty which made grotesque this business of walking in to dinner, and (worse) of eating it. Of course they stumbled on the subject, which might have been accident, as soon as they went into the dim and draughty dining-hall.