After a few minutes had passed the airplane, making a wide, sweeping circle, flew directly toward the German lines, soon disappearing behind the trees in the park.
"Now's our chance!" cried Don.
"Yes. Let's cast aside worries and test the laws of chance," laughed the art student.
"In other words, beat it before another plane comes into view," cried Chase.
Leaving their place of concealment, the boys broke into a run, and, covering the distance to the château in short order, mounted the broad flight of steps at the entrance.
Presently Don Hale was using the big bronze knocker in a lusty fashion.
All three were very curious—very expectant—very hopeful indeed that in another moment the great door might swing wide open and the distinguished-looking Frenchman greet them.
But nothing of the kind occurred.
"It doesn't seem as if there was going to be an instalment to this part of the story," pronounced Dunstan, in a tone of disappointment.
"He may be in there, however, and won't come out," exclaimed Don.