“Why not?”
“Well, if it is—it must be an American submarine!”
Johnny looked at her for a moment in silence.
“It’s not an American submarine,” he said, after a time. “I’ve seen them, and this one’s the wrong shape. It’s some spy submarine, looking over the bottom of the sea and getting information for the next war. I shouldn’t be surprised if a large part of that war were fought right in this Caribbean Sea!
“What’s more,”—he rose to his feet—“I’ll bet a dollar that the thing that took Samatan and me for a ride in the steel ball, was that same submarine!”
“Trouble with you,” Doris laughed merrily, “is too much imagination.”
“You just wait and see,” Johnny replied with a smile.
The sound of oars at this moment, announced the return of Dave and the professor from their day’s explorations.
CHAPTER XII
JOHNNY’S DAY OFF
Next morning Johnny and old Samatan sailed away toward the smiling face of the rising sun.