It was still unfastened, and the children climbed in excitedly, almost tumbling on to the floor in their eagerness to go hunting for the pearls.

"Behind the curtains, in the cupboards, up the chimney, every place you can think of!" said Fatty, in a thrilled voice. "Go to it, Find-Outers. Solve the mystery if you can!"

Then such a hunt began. Every cupboard, every shelf, every nook and cranny in that Hall were searched by the bright-eyed Find-Outers. Buster, eager to help, though without the faintest idea of what they were looking for, scrabbled about too, having a vague hope that it might be rabbits.

Fatty even examined the floor-boards, but none of them was loose. At last, when it seemed as if every single place had been searched, the five children sat down to rest and discuss the matter.

"I suppose it is here, that necklace!" said Daisy. "I'm beginning to think it isn't."

"I feel as if I'm playing Hunt-the-Thimble," said Bets. "Where is the thimble? It must be in some jolly good place, that necklace!”

Fatty stared at Bets. "Bets," he said, "supposing we went out of the room, and you had to hide a pearl necklace somewhere here, what difficult place would you think of?"

Bets looked round the Hall and considered. "Well, Fatty," she said, "I've always noticed that when people play Hunt-the-Thimble, the most difficult hiding-places to find are the easiest ones really."

"What do you mean? " demanded Pip.

"Well," said Bets, "I remember looking everywhere for the thimble once—and nobody found it—and yet where do you think it was? On Mother's finger!"