"Yes, yes; as sure as I'm standing here I saw a streak of light."
Although neither Dunstan nor Chase had observed it they were by no means incredulous. If some one had been in the château before, why not now?
There was something very strange—very mysterious in the whole affair. To the minds of the Red Cross men it became quite clear that the person, or persons, had known of their presence in the building and purposely kept out of their way, though for what reason, of course, none could conjecture.
"And so the adventure continues!" exclaimed Chase, rather slowly.
"Curious—curious indeed!" murmured Dunstan.
Don Hale's eyes were dilated with excitement and interest.
"Yes, sir, I just happened to catch it!" he cried. "A bright spot appeared for a single instant—then was gone. Shall we go back and investigate?"
"I certainly haven't the slightest intention of doing so," responded Chase, most emphatically. "Besides, what good would it do? Whoever is there would probably keep out of sight the same as they did before."
Don thereupon appealed to Dunstan.
The latter, however, shook his head.