"Search me. All I know is he's on his way."
For some time their way led along the top of the ridge and Bob had just glanced at his watch and was about to tell Jack, who was a few feet ahead, that it was four o'clock, when he turned and held up his hand as a signal for silence.
"What is it?" he asked as soon as he had come up to him.
"I think he's just ahead of us. I saw a man a minute ago just beyond that big tree."
"Only one?"
"That's all I saw. Of course, there might have been someone ahead of him."
"Think he saw you?"
"I'm sure he didn't."
"That's good. Now to keep him in sight without letting him know it."
They advanced now with extreme caution, stopping every few minutes to listen and nearly every time they could hear the cracking of brush or the rattle of stones as their quarry pushed on in advance of them. Now and then they caught sight of him and once Jack was sure he saw two men.