"She does not look much like a girl who is engaged to the most successful man of the day, does she?" Mrs. Hoskin-Heath said to Lord Landsend.

"No, you are right," Lord Landsend whispered. "She is afraid Sir William's machine won't work, and that the whole thing won't come off, don't you know. And, for my part, though I don't profess to understand exactly what Sir William is going to show us, I bet a fiver that it is not more wonderful than things I have seen scores of times at Maskelyne and Cook's. Wonderful place that, Mrs. Hoskin-Heath. I often go there on a dull afternoon; it makes one's flesh creep, 'pon my word it does. I have been there about fifty times, and I have never yet felt safe from the disappearing egg."

The butler was seen to come up to Lord Malvin and ask him a question. The peer looked round, and seemed to see that every one was prepared to move. He nodded to the man, who crossed the hall, bowed, and opened a door to the right of the great central staircase.

"My master tells me to say, my lord," he said, addressing Lord Malvin, but including the whole of the company in his gaze—"my master tells me to say that he will be very much obliged if you will come into the laboratory."

A footman went up to the door and held it open, while the butler, with a backward look, disappeared into the passage, and led the way towards the real scene of the afternoon's events.

As that throng of famous people walked down the long corridor, which led past the study door, not a single one of them knew or could surmise that all and severally they were about to experience the emotion of their lives.


CHAPTER XXII

THE DOOM BEGINS

The visitors found themselves in the laboratory, a large building lit by means of its glass roof.