"The windows are barred," he said. "Two men guard the door. You
cannot escape. Decide!"

He looked longingly at Evelyn and followed Gustav from the room. The
heavy door shut silently behind them but not before they had a glimpse
of the two soldiers standing at attention in the hallway.

While they stood looking at it, it opened and Otto entered, closing it
after him.

"I may as well tell you," he said. "You will shoot as a spy if you do
not explain your charts and figures and leave the country."

Then as though he could not conceal his triumph, he added, "In any
case, you know your daughter remains here."

"Remains here?" cried the Professor. "How is that? What do you mean?"

Otto shrugged his shoulders.

"I like her," he said coolly. "I might marry her. You are very
lovely," he added, turning his bold, cold eyes on Evelyn.

She hid her face against her father's shoulder.

Otto laughed.

Jack sprang at him with a shrill cry. The big man caught the boy, and
flung him contemptuously to the floor.