"Let's play we're shipwrecked," suggested Freddie, who was always anxious to "pretend" something or other.
"All right," agreed Flossie. "You'll be Robinson Crusoe, and I'll be your man Thursday."
"Friday—not Thursday," corrected Freddie, for his father had read to him part of Robinson's adventures.
The little twins were allowed to take some of their lunch, and go off to one side of the island, there to play at being shipwrecked. Mr. and Mrs. Bobbsey sat in the shade and talked, while Nan, Dorothy, Bert and Harry went off on a little "exploring expedition," as Bert called it. Bert was making a collection of stones and minerals that year, and he wanted to see what new specimens he could find.
Suddenly the peacefulness of the little island was broken by a cry of:
"Oh, Mamma! Papa! Come quick! Freddie's in the cave, and can't get out. Oh, hurry!"
"That's Flossie's voice!" cried Mrs. Bobbsey, in alarm.
Mr. Bobbsey did not say anything. He just ran, and soon he came to the place where Flossie and Freddie had gone to play shipwreck. He saw Flossie jumping up and down in front of a little hill.
"Where's Freddie?" asked Mr. Bobbsey.
"In there," Flossie answered, pointing to the pile of dirt that looked to have been freshly dug. "We made a cave in the side of the and Freddie went in to hide, but he dirt slid down on him and he—he's there yet!"