"And was it?" demanded Frank, hastily, frowning at the same time.
"Nobody else," replied Andy, impressively. "They must have swung around, passed up to the old mill on that side road, and from the upper windows have been watching us all the time through the fieldglasses they carry!"
CHAPTER V
FIGURING IT ALL OUT
"It begins to look as though you were right, Andy, and that these strangers certainly feel an uncommon interest in what we've been doing up here," said Frank, seriously.
"Oh! I don't take much of the credit for hitting on that idea, Frank," declared the other Bird boy, quickly. "You kept watching that Marsh right from the start. I could see a question in your eye every time you looked at him. And it spurred me on to keeping closer tab over his ways."
"Are they still up there, d'ye think?" queried Frank; while Larry, Elephant, and Stuttering Nat hung around, saying nothing, but listening for all they were worth.
"No," replied Andy; "I've got an idea they began to suspect some of you were looking that way. Anyhow, I saw Marsh duck his head, and think they came down. No use going in to take a shy at 'em now."
"I'd give a fit to know what they are up to?" mused Frank, a thoughtful look on his face.
"Well, perhaps we can hit somewhere near the facts if we start guessing," remarked Andy, with a knowing nod.