“Unless what?” Betty’s throat was dry.
“Unless we go to the rescue!” Lena pulled at her arm. “There’s not a moment to lose.”
“But we have no plane.” Betty stared first at Lena, then at Norton. It was a tense moment of indecision.
“There’s a motorboat, a pretty fast one. I can run it, you know that!” Lena’s voice was tense with emotion.
“Yes, I know. Norma told me how you saved them.”
“Then come on. Come on, now! We—” Lena’s voice broke; she did not finish.
Betty looked at Grandfather. He did not speak, merely nodded his head.
“All—” Betty gulped, “all right, I’ll go!”
Instantly the two girls were down from the tower and racing like mad for the dock.
Once at the dock Lena unscrewed the gas tank cap, flashed a light down into the tank, then, after a few twists at the cap said, with astonishing calmness: