As Mollie was never under any circumstances expected to act as people thought she should act, so this occasion was no exception to the rule. She pushed Amy and Grace aside, glared at Betty, and sat up with a little jerk. "For goodness' sake, stop undressing me, Betty Nelson!" she said. "I'm not dead yet." "So we see," said Betty, while her eyes lost their anxious expression and began to twinkle instead. "But you might have been, you know, if we had left you to yourself." Mollie looked down at her dripping clothes ruefully and then out at the rushing water. "I guess you are right," she said with a little grimace. "It wasn't very pleasant while it lasted, either. Whew, but that water was cold!" She shivered involuntarily and Betty sprang to her feet. "We had better be getting back to the lodge," she said. "You can put on some dry things, Mollie, and we girls will get you some hot soup. You are chilled to the bone." "Nonsense," denied Mollie grumpily. "I'm beginning to feel fine and warm. Besides," she added, trying to cover a chill that fairly made her teeth ache, "I want to stay and find out about that thing that got us into all this fuss." "Nonsense," Grace put in. Up to this time Grace had been made speechless by Mollie's sudden recovery. "You are shivering so you can't sit still." "It makes me cold just to look at you," added Amy. "Don't be foolish, honey," said Betty impatiently. "You can't sit there all day in dripping clothes, and besides you will really get cold." "Humph," grunted Mollie, getting to her feet rather unsteadily and shaking out her sodden skirts. "I guess this isn't the first time I have taken a dip in cold water. And besides," she added impatiently: "I don't know about you girls, but I would like to know just what that thing was that we saw dart beneath the falls." "That was what made you fall into the water, wasn't it?" asked Betty, her forehead wrinkling thoughtfully. "You leaned so far out to see--" "Yes, yes," Mollie interrupted impatiently, all her curiosity revived. "That was what made me fall into the water all right. But what I want to know is--what was it?" "I don't know," said Betty, shaking her head. "I didn't see it." "Neither did I," Grace added. Mollie looked from one to the other of them open-mouthed. Then she turned to Amy. "You saw it, didn't you?" she asked. "You screamed, you know." "Yes," said Amy, nodding her head very solemnly. "And it looked to me a lot like what we saw last night." "Thank goodness, you saw it too or the girls would surely think I had been dreaming or was crazy," said Mollie, with relief. Then she suddenly turned and started off into the woods. "I'm going all alone to find out what that was," she told her stupefied chums. "I've got to clear up the mystery before I'm an hour older." But this time Mollie found that there was some one stronger than she, and that was Betty. The Little Captain ran after her and brought her back, protesting but captive.