One snarling curse as they had started, for not having done as he had been told, was the total of their conversation during the trip. During the rest of the time the transformation to the normal kept Lakington busy, and Hugh could see him reflected in the wind-screen removing the make-up from his face, and changing his clothes.

Even now he was not quite clear how the trick had been worked. That there had been two cabinets, that was clear—one false, the other the real one. That they had been changed at the crucial moment by the girl Irma was also obvious. But how had the pearls disappeared in the first case, and then apparently reappeared again? For of one thing he was quite certain. Whatever was inside the parcel of gold and silver tissue which, for all he knew, they might be still staring at, it was not the historic necklace.

And he was still puzzling it over in his mind when the car swung into the drive at The Elms.

“Change the wheels as usual,” snapped Lakington as he got out, and Hugh bent forward to conceal his face. “Then report to me in the central room.”

And out of the corner of his eye Hugh watched him enter the house with one of the Chinese cabinets clasped in his hand....

“Toby,” he remarked to that worthy, whom he found mournfully eating a ham sandwich in the garage, “I feel sort of sorry for our Henry. He’s just had the whole complete ducal outfit guessing, dressed up as an Indian; he’s come back here with a box containing the Duchess’s pearls or I’ll eat my hat, and feeling real good with himself; and now instead of enjoying life he’s got to have a little chat with me.”

“Did you drive him back?” demanded Sinclair, producing a bottle of Bass.

“Owing to the sudden decease of his chauffeur I had to,” murmured Hugh. “And he’s very angry over something. Let’s go on the roof.”

Silently they both climbed the ladder which had been placed in readiness, to find Peter Darrell and the American detective already in position. A brilliant light streamed out through the glass dome, and the inside of the central room was clearly visible.

“He’s already talked to what he thinks is you,” whispered Peter ecstatically, “and he is not in the best of tempers.”