"Then it began to rain," said Nan, "and we were all as worried as could be. We looked at our boats, and when we found they were tied at the dock we didn't think you were out on the water. Then when it stopped raining Bert and I started out to find you and so did Sam, though he went a different way."

"And we called and called to you," said Bert. "Didn't you hear us shouting?"

"Maybe that was the noise we heard in the cave," said Freddie to his sister.

"What about this cave?" asked Bert. "Tell us where it is."

Then, riding back to camp in the goat wagon, the two small twins told again of the big hole in which they had taken refuge from the storm.

"I'd like to see that," Bert said. "We'll go there to-morrow."

"We can walk there, or Whisker can take us," said Freddie. "And then we can come home in the boat, but you'll have to take some oars, Bert."

"That's so--there _is_ a boat!" exclaimed the older Bobbsey boy. "I wonder whose it can be?"

But they did not learn at once, for the next day, when they all went to the cave--including Mr. and Mrs. Bobbsey--the boat was not there.

"Somebody untied it and took it away," said Freddie, as he pointed out the rock to which he had made fast the rope.

"Are you sure you tied it tightly?" asked his father.

"Yep. I made the same kind of knot you showed me," and Freddie told how he had done it. Flossie, too, was sure her brother had fastened the boat properly.

"Well, then somebody's been here in the cave," said Bert. "Say, it's a big place, Daddy! Can't we get a lantern and see where it goes to back there," and he motioned to the dark part.

"Some time, maybe, but not now," said Mr. Bobbsey, who, with his wife, had walked along the island path to the cave while the children rode in the goat wagon. "I didn't know there was a cave on Blueberry Island. I don't believe many persons know it is here. But the boat might belong to some of the berry pickers, and they hunted for it until they found it."

"Did the blueberry pickers make the funny noise in the cave?" asked Flossie.

"I don't know," replied her father. "I don't hear any noise now. I presume it was only the wind."

Mr. Bobbsey and Bert, lighting matches, went a short way back into the cave, but they could see very little, and the children's father said they would look again some other day.

"But, Flossie and Freddie, you mustn't come here alone again," said Mr.

Bobbsey.

"If it rains and we're near here can't we come in if we haven't an umbrella?" asked Freddie.

"Well, yes, perhaps if it rains. But you mustn't go out in a drifting boat again, rain or no rain," ordered Mr. Bobbsey.

Flossie and Freddie promised they would not, as they always did, and then the camping family started back for their tents.

"What do you think of that cave, the boat's being taken and all that's happened?" asked Mrs. Bobbsey in a whisper of her husband, as they walked toward camp together.

"I don't know what to think," he said slowly.

"Do you suppose the gypsies could be in there?"

"Well, they might. But don't let the children know. They are having a good time here and there's no need, as yet, to frighten them."

For the next few days there were happy times in Twin Camp. The children went on many rides in the goat wagon and had other fun. Then, one afternoon when they were all sitting near the tents waiting for Dinah to get dinner, they saw a steamer heading toward the little dock.

"Oh, maybe it's company!" cried Flossie, clapping her hands.

And so it proved, for when the boat landed Mrs. Porter and her little girl, Helen, got off.

"We came to see how you were," said Mrs. Porter. "Helen wanted a trip on the water, so we came on the excursion boat. We're going back this evening. How are you?"

"Very well, indeed," said Mrs. Bobbsey, "and glad to see you. Helen can play with Flossie and Freddie."

"Did you see any of the gypsies, and did they have my talking doll?"

asked Helen as soon as she had taken off her hat in the tent and had gone outside to play with the two small Bobbsey twins.

CHAPTER XV

THE DOLL'S DRESS

"Haven't you got your lost doll back yet?" asked Freddie, as he moved over on a board, nailed between two trees, to make room for Helen to sit down between him and Flossie.

"No, I haven't found Mollie," answered the little girl, who had come to visit her friends. "I guess she's a gypsy by this time."

"Helen, are you sure a gypsy man took your doll?" asked Nan, who had been sent out by her mother to see if the little ones were all right.

"Yes, I'm sure," answered Helen. "I left her in the yard; and, besides, didn't Johnnie Marsh and me both see the gypsy man runnin' off with her?"

"Well, maybe it did happen that way," said Nan. "But what makes you think we might have seen that gypsy man here, Helen?"

"'Cause Johnnie Marsh said gypsies were camped on Blueberry Island."

"We haven't seen any yet," remarked Bert, who had come out to ask the little girl visitor about some of his boy friends in Lakeport.

"Maybe they're hiding 'cause they've got Helen's doll," said Flossie.

"And maybe they're in the cave Freddie and I found."

"Did you find a cave?" asked Helen. "My mamma read me a story once about a cave and a giant that lived in it. Did your cave have a giant inside?"

"It had a noise!" answered Flossie excitedly. "Me and Freddie heard it!

But we didn't go see what it was. Are you hungry, Helen?" she asked, suddenly changing the subject.

"Yes, I am. I only had some cake and ice-cream on the boat."

"We're goin' to have ice-cream!" Freddie cried. "Sam chopped up the ice this morning and I heard him turning the freezer. I wish dinner would hurry up and be ready."

It was not long after this that fat Dinah rang the gong which told that the meal was cooked, and soon they were all seated in the dining tent making merry over it. Mrs. Porter told how Helen had been teasing, ever since the Bobbseys had come to Blueberry Island, to be brought for a visit.