"Good luck to you!" returned Harris warmly. "I'll go at once and put Burton next."
While the officer moved toward the front of the house, Matt started for the rear of the yard on his way back to the air ship.
[CHAPTER XIII.]
DARING WORK.
When Matt had got outside the iron fence and just within the screen of timber, he turned. Helen Brady, bareheaded and plainly just from the interior of the house, stood at the edge of the roof, following Matt with her eyes.
Matt waved his cap to her, and this was the first intimation the girl had had that she was seen. She fluttered her hand in response and then stretched out both arms appealingly.
Matt nodded his head vigorously, to signify that her appeal was understood, and that it would be answered; then he pointed through the woods in the direction of the air ship. Helen turned her head to look in the direction indicated.
From her elevated position she must have been able to see the gas bag of the Hawk over or through the tops of the trees. Looking back to Matt, she waved one hand and nodded.
Matt placed a finger on his lips and waved toward the house in an endeavor to make the girl understand that she must be very careful, so as not to let her captors know where she was.