"Then, if the poilu won't come to us we must go to the poilu," declared Chase, very firmly.
The trio hurried down the steps, walked around the building and presently reached the open window.
Forthwith, Don Hale climbed inside.
The aviator's son half expected to hear a challenge hurled at him, but a dreary, mournful silence pervaded the great apartment, which one swift glance showed him to be entirely empty.
"Well, it may be another game of hide-and-seek," he murmured. "But, with daylight in our favor, it ought to be a bit easier than it was the other night."
One after another, Dunstan and Chase followed Don into the château.
"I'm back here again, old chap, to find out to whom I was talking," shouted Chase. "Come—don't be bashful! And kindly leave your revolver behind."
His words rang out startlingly clear, but the footsteps which the ambulanciers thought they might possibly hear in response did not sound.
"Never mind. It doesn't prove anything," said Chase. "To work, boys!"
In view of Chase Manning's strange experience, Don Hale found quite an enjoyable thrill to the situation.