"Look! Look out there to the north!"
"A sail!" shouted the ensign, springing to his feet.
"Yes. A steam yacht, rather! She's coming this way, too!"
"That's what. But how can we signal her? If she doesn't hurry she may be too late!"
"We can wave and shout!"
The ensign shook his head.
"She is too far off to see or hear us. Is there no other way to attract her?"
A dozen plans were thought of and discarded. Then Rob spoke:
"I've thought of a way, but it's a desperate one."
"Never mind, what is it?"