The secret of the old mill

by Franklin W. Dixon

"You're crazy, Markel," replied some one. "There's no one out there."

"I tell you I saw some one crawling down through the grass. I'm sure of it. I saw him from that upper window."

"Whereabouts?"

"Out there—see? Can't you see something dark up there?"

There was silence for a moment or so. Then the second man laughed.

"It's only a log."

"I tell you, it isn't a log. A log doesn't move."

"That isn't moving."

"It was."

"Well, if you're so sure of it, why don't you go on up and see? You're getting so nervous lately that you think people are hanging around here all the time."