“Let’s surprise ’em,” suggested Ted, filled with a sudden spirit of mischief.

“How?” asked Janet, making sure Trouble was safe playing on the sand, well out of reach of the waves.

“Let’s go up softly and tip over the umbrella and holler ‘Boo!’”

“All right!” Janet agreed. “They won’t mind.”

“No,” said Ted. “They’re real jolly!”

Brother and sister went on tiptoe across the sand, up behind the big sun umbrella. Catching hold of one edge of it, Ted tipped it to one side. Then he and Janet yelled:

“Boo!”

But what was their astonishment to see, looking at them with rather startled faces, a perfectly strange man and woman. Both had white hair, but they were not Mr. and Mrs. Keller at all!

CHAPTER VII
LOST IN THE SAND

Janet and Ted stopped short in their tracks after tipping over the umbrella. They stood there, looking at the strange man and woman—that’s what the Curlytops did.