At five o'clock, on a gusty October afternoon, of the year 1916, Peter had just finished his tea and settled down, with a pipe and the last number of the _British Weekly_, for five minutes' reading, before he turned to the secret of his happiness again. Precisely at this moment, the Commander of the U-99, three miles away to the north, after making sure through his periscope that there were no patrol boats in the vicinity, rose to the surface, and began to look for the _Hatchets'_. He, too, had reasons for wishing to get inside the light-house, if only for half an hour. It was possible only by trickery; but he thought it might be done under cover of darkness, and he was about to reconnoiter. When he first emerged, he had some difficulty in descrying his goal across that confused sea. His eye was guided by a patch of foam, larger than the ordinary run of white-caps, and glittering in the evening sun like a black-thorn blossom. As the sky brightened behind it, he saw, rising upright, like the single slim pistil of those rough white petals, the faint shaft of the light-house itself. He stole nearer, till these pretty fancies were swallowed up in the savagery of the place. It greeted him with a deep muffled roar as of a hundred sea-lions, and the air grew colder with its thin mists of spray. The black thorns and white petals became an angry ship-wrecking ring of ax-headed rocks, furious with surf; and the delicate pistil assumed the stature of the Nelson Column. It made his head reel to look up at its firm height from the tossing conning-tower, as he circled the reef, making his observations. He noted the narrow door, twenty feet up, in the smooth wall of the shaft. There was no way of approaching it until the rope-ladder was let down from within. But, after midnight, when the custodian's wits might be a little drowsy, he thought his plan might succeed. He noted the pool on the reef, and the big boulder near the base of the tower. There was only one thing which he did not see, an unimportant thing in war-time. He did not see the beauty of that unconscious monument to the struggling spirit of man. Its lofty silence and endurance, in their stern contrast with the tumult below, had touched the imagination of many wanderers on that sea; for it soared to the same sky as their spires on land, and its beauty was heightened by the simplicity of its practical purpose. But it made no more impression on Captain Bernstein than on the sea-gulls that mewed and swooped around it. When his observations were completed, the U-99 sheered off and submerged. She had to lie "doggo," at the bottom of the sea, for the next few hours; and there were several of her sisters waiting, a mile or so to the north, on a fine sandy bottom, to compare notes. Two of these sisters were big submarine mine-layers of a new type. The U-99 settled down near them, and began exchanging under-water messages at once.