On the southwestern tip of the reef they discovered a possible opening. Shann eyed the narrow space between two fanglike rocks dubiously. To him that width of water lane seemed dangerously limited, the sudden slam of a wave could dash them against either of those pillars, with disastrous results, before they could move to save themselves. But Thorvald pointed their blunt bow toward the passage with seeming confidence, and Shann knew that as far as the officer was concerned, this was their door to the lagoon. Thorvald might be stubborn, but he was not a fool. And his training and skill in such maneuvers was proved when the canoe rode in a rising swell in and by those rocks to gain the safety, in seconds, of the calm lagoon. Shann sighed with relief, but ventured no comment. Now they must paddle back along the inner side of the reef to locate the beaches, for fronting them on this side of the well-protected island were cliffs as formidable as those which guarded the first of the chain at which they had aimed. Shann glanced now and then over the side of the boat, hoping in these shallows to sight the sea bed or some of the inhabitants of these waters. But there was no piercing that green murk. Here and there nodules of rock projected inches or feet above the surface, awash in the wavelets, to be avoided by the voyagers. Shann's shoulders ached and burned, his muscles were unaccustomed to the steady swing of the paddles, and the fire of the sun stabbed easily through only two layers of ragged cloth to his skin. He ran a dry tongue over dryer lips and gazed eagerly ahead in search of the first of the beaches. What was so important about this island that Thorvald _had_ to make a landing here? The officer's stories of a native race which they might turn against the Throgs to their own advantage was thin, very thin indeed. Especially now, as Shann weighed an unsupported theory against that ache in his shoulders, the possibility of being marooned on the inhospitable shore ahead, against the fifty probable dangers he could total up with very little expenditure of effort. A small nagging doubt of Thorvald's obsession began to grow in his mind. How could Shann even be sure that that carved disk and Thorvald's hokus-pokus with it had been on the level? On the other hand what motive would the officer have for trying such an act just to impress Shann?