"I wouldn't if I were you," he said quietly.
Frank stepped back.
"Oh, all right," he said.
The little motorboat began to move.
The captor raised his voice.
"Hans! Franz!" he called.
There was no answer and after a moment he repeated his calls.
"If you were calling your men, I fear you are wasting time," said Frank quietly.
"What?" exclaimed his captor.
"Exactly," replied Frank. "It was necessary for us to shoot them before you were fortunate enough to find us."