"That is just exactly what I am getting at," said Mollie earnestly, leaning forward and resting her elbows on the table while the girls watched her interestedly. "We don't know anything about it, but that is no reason why we should sit back and twiddle our thumbs and start at shadows." "Well, for goodness' sake, tell us what's on your mind," prompted Grace impatiently. "We haven't sat back and twiddled our thumbs and started at shadows because we enjoyed it, you know." "Now my plan is this," said Mollie, ignoring Grace, who shrugged her shoulders and reached for her candy box. "Suppose we take a tramp through the woods to the head of the falls? It is a beautiful hike and the scenery at the falls is magnificent. But aside from that we will have a chance to find out something about this thing that will do away with the mystery." "If it doesn't do away with us at the same time," said Amy so ruefully that they had to laugh at her. "Well, what do you say?" asked Mollie, looking around the circle of thoughtful faces--her glance a dare. For a moment it looked as if they all might refuse to go, but then their sporting blood came to the fore and they decided for the adventure. But when they told Mrs. Irving about their project and begged her to say yes to it, she looked very doubtful and only consented at last on the proviso that she was to go with them. This they were only too glad to have, and a few minutes later the lodge hummed with excitement and preparation once more. To the Outdoor Girls, active and fun-loving by nature, to be quiet for a few days was nothing short of torture. So now, even though there was still more than a little fear of the "Thing" in their hearts, they found relief in the promise of adventure. They put up some sandwiches and fruit in a basket in case they were not able to get home by noon. Then they locked the door of the little lodge and started down the steps. They hesitated before starting into the woods, and Mollie had a happy thought. "We can go part of the way along the road," she said. "And then there is a path that leads directly through to the head of the falls." The celerity with which they accepted this suggestion seemed funny to them afterward, but at the time they had other things to think about. Mostly they were wondering if they would really be able to hold on to their nerve long enough to see the adventure through. "I wish," said Betty wistfully, as she had wished so many times of late, "that the boys were here. They could help us out so beautifully." And she sighed, for when she spoke of "the boys," she always thought of one boy most--and that one was Allen.