"Yes," he finally announced, "this is our only chance. But as Jeanne and Helene are my especial care I'm going first, Tom. I've already imposed on you and not done my full share since entering the chateau."

With these words Jack crawled out of the window.


CHAPTER XXIII

THE ONLY WAY

As Tom leaned out of the window he could just manage to see the figure of his chum flattened against the stone wall of the chateau. Jack was clinging close, like a human fly might have done, clutching some object which allowed him to move his feet along the slender ledge.

"Come on; it's all right!" floated back in a whisper.

Tom was not waiting to be assured on that point. Already he had pushed his body halfway over the window-sill, and his groping feet sought the friendly ledge. Then he, too, started to shuffle along, finding some means for holding himself there.

Of course it was not pleasant to contemplate a fall. The air service boys knew there was a considerable depth lying below, and it might be that hard stones lay there.