“Escape? Escape from what?” Dave ejaculated.

“Well, we might have to escape, you see.” Mildred leaned forward eagerly. Her eyes shone. “Grandfather always has opposed those men—spies, really—who are trying to get all the islanders under their control. So they hate him. Just recently—”

She went on to tell of the code message flashed by the green arrow and of other strange and unexplained happenings. “Of course,” she added, “nothing has been done yet. But you never can tell.”

“And you want me to help you find that motorboat of yours, with my steel ball? Am I a good guesser?”

“You certainly are,” the girl replied, frankly.

“And you didn’t really want to go down in the steel ball—you were terribly frightened by the thought? But you believed it might help, so—”

“So I went,” she breathed. “You don’t mind, do you?”

“Mind?” he exploded. “I think you are a grand, brave, little girl. If you were my sister,”—he paused to grin good naturedly.

Smiling back at him, Mildred felt sure she would be aided in her search for her grandfather’s motorboat. The thought made her very happy.

CHAPTER IX
DAVE’S ELECTRIC GUN