“Are you the only agent of the Gerka in the plant now?” asked Timms, his words snapping through the quiet of the room.

“Yes,” replied Dubra so quickly that the others were convinced he had told the truth.

“And your job was to wreck the hangar and delay construction until another and more powerful agent could get here and finish the job of sabotage against the Goliath?” went on Timms.

This time there was no reply to the question and Dubra turned his face toward the wall.

“I’ll give you a minute to make up your mind,” said Timms.

The seconds ticked away and there was no sound from any of the four in the small room.

“Make up your mind,” warned Timms. “Ten more seconds and the lights go out.”

The secret service chief, Andy and Bert turned to leave the room. They were on the threshold when Dubra called them back.

“My job was to wreck the hangar,” he confessed, the words coming slowly and evidently with the greatest reluctance.

“Who is going to attempt to wreck the Goliath?” demanded the secret service chief.