Wyn darted a glance over her shoulder. There, looming gray and ghostly, was the tall sail they had seen once before. The strange, square-nosed bateau was drifting by, but at some distance. Evidently the catboat was well hidden in the shadow of the island. Suddenly Polly reached over the edge of the boat and seized Wyn's shoulders. "Don't try to climb in," she whispered. "They'll see or hear the splash." "All right," breathed back the captain of the Go-Aheads. "It's Eb Lornigan and some of his friends. Eb is a disgrace to the lake. He's been in jail more than once," whispered Polly. But Wyn's shoulders began to feel cold. The night air, after all, was not really warm. "I'm going down again," she whispered. "Did--did you find it?" queried Polly. "No. But I will," declared the other girl, confidently, and slipped into the water. She ventured under the bottom of the catboat and, turning suddenly, braced her feet against it, and so flung herself down into the depths. She descended more swiftly with the momentum thus gained, traveling toward the bottom on a different slant than before. With her hands far before her she defended her head from collision with any sunken object there might be down here. And this time she actually did hit something again. She turned quickly and grabbed at it with both hands. It seemed like a sharp, smooth pole sticking almost upright in the water. There was a bit of rag, or marine plant of some kind, attached to it. She struggled to pull herself down by the staff, but she had been below now longer than before. Just what the staff could be she did not imagine until she had again turned and "kicked" her way upward. "It's the pennant staff of the sunken boat!" she gasped, as she came to the surface and could open her mouth once more. "Hush! what's the matter with you?" demanded Polly, in a low voice, directly at hand. "Oh! have they gone?" "The bateau is out of hearing distance. But you _do_ splash like a porpoise." "Nonsense! Let me climb up." Polly gave her some help and in a few moments Wyn lay panting in the tiny cockpit of the boat. "Did--did you find anything?" queried Polly, anxiously. Wyn told her what she believed she had found underneath the water, and the position of the staff. "It must be lying bow on to us here," she said. "Oh! do you suppose it really _is_ the _Bright Eyes_?" "It's something," replied Wyn, confidently, pulling one of the blankets around her. "I'm going down myself," declared Polly, sharply. "All right. Maybe you can find more of the boat. It's there." Polly sprang up into the bow of the catboat, poised herself for a moment and then dived overboard. She could outswim and outdive any of the Go-Ahead girls--and why not? She was in, or on, the lake from early spring until late autumn. Polly was under the surface no longer than Wyn; but when she came up she struck out for the _Coquette_ and scrambled immediately into the boat.