"Does that mean there's competition in the field?"

"It means just that." Simon's gaze was sweeping systematically over the other guests; and at that moment he saw the men he was looking for. "You see that dark bird who looks as if he might be a gigolo? Face like a pretty boy, till you see it's just a mask cut in granite… That's Philip Carney. And the big fellow beside him — just offering the Dempster-Craven a cigarette. That's George Runce. They're two of the slickest jewel thieves in the business. Mostly they work the Riviera — I don't think they've been in England for years. Kate was talking in the plural all the time, and I wondered who she meant."

Peter's mouth shaped a silent whistle.

"What's going to happen?"

"I don't know definitely; but I should like to prophesy that at any moment the lights will go out —"

And as he spoke, with a promptness that seemed almost uncanny, the three enormous cut-glass chandeliers which illuminated the ballroom simultaneously flicked out as if a magic wand had conjured them out of existence; and the room was plunged into inky blackness.

The buzz of conversation rose louder, mingled with sporadic laughter. After trying valiantly to carry on for a couple of bars, the orchestra faded out irregularly, and the dancers shuffled to a standstill. Over in one corner, a facetious party started singing, in unison: "Where — was — moses — when — the — lights— went — out?"… And then, rising above every other sound, came Mrs. Dempster-Craven's hysterical shriek:

"Help!"

There was a momentary silence, broken by a few uncertain titters. And Mrs. Dempster-Craven's voice rang wildly through the room again.

"My pendant! My pendant! Put on the lights!"