“No, m’lady,” said Nanny firmly and unexpectedly.

“Oh. Are you certain, Nanny?”

With a scarlet face and a formidable frown Nanny said that she was certain.

“Then, that’s no good,” said Lady Charles. “And then, Mr. Alleyn, I waited for Violet. She was rather a long time and I remember that my brother-in-law shouted again for her. The two girls, Frid and Patch, came in, and then at last she came back and she reminded me that she and Gabriel didn’t like working the lift themselves, so I came along here leaving her on the landing, and asked one of the boys to take them down.”

It seemed to Alleyn that as Lady Charles reached this point a curious stillness fell upon the room. He looked up quickly. The Lampreys had returned to their former postures. Lord Charles again swung his eyeglass, Henry’s hands were again driven into his trousers pockets, and again the twins stared at the fire while Patch, her chin on her knees, squatted on the floor by Roberta Grey. And Miss Grey still sat erect on her stool. Alleyn was reminded of the childish game of Steps in which, whenever the “he” has his back turned, the players creep nearer, only to freeze into immobility whenever he turns round and faces them. Alleyn felt sure that some signal had passed between the Lampreys, a signal that, by the fraction of a second, he himself had missed. At this hated and familiar sign of guardedness his own attention sharpened.

“Ah, yes,” he said. “We may as well clear up this point as we come to it.” He looked at the twins. “Mr. Fox tells me that Lord Charles didn’t notice which of you went down in the lif’t. Which was it?”

“I did,” said the twins.

So complete a silence fell upon the room that Alleyn heard a voice in the street below call for a taxi. The fire settled down in the grate with a little sigh and, as clearly as if, instead of sitting stone-still in their chairs, the Lampreys had made a swift concerted movement, Alleyn heard them close their ranks.

II

“Hullo,” he said amiably, “a difference of opinion! Or did you both go down in the lift?”