The _Calipha_ was almost at a standstill, awaiting the doctor's brig, which was coming up to her on the port side. Every one was leaning over the railing watching her. Mr. Watson and Mr. Sabin, who had just come up the gangway together, turned away towards the deserted side of the boat, engaged apparently in serious conversation. Suddenly every one on deck started. A revolver shot, followed by two heavy splashes in the water, rang out clear and crisp above the clanking of chains and slighter noises. There was a moment's startled silence--every one looked at one another--then a rush for the starboard side of the steamer. Above the little torrent of minor exclamations, the captain's voice sang out like thunder. "Lower the number one boat. Quartermaster, man a crew." The seven passengers, two stewards, and a stray seaman arrived on the starboard side of the gangway at about the same moment. There was at first very little to be seen. A faint cloud of blue smoke was curling upwards, and there was a strong odour of gunpowder in the air. On the deck were lying a small, recently-discharged revolver and a man's white linen cap, which, from its somewhat peculiar shape, every one recognised at once as belonging to Mr. Sabin. At first sight, there was absolutely nothing else to be seen. Then, suddenly, some one pointed to a man's head about fifty yards away in the water. Every one crowded to the side to look at it. It was hard at that distance to distinguish the features, but a little murmur arose, doubtful at first, but gaining confidence. It was the head of Mr. Watson. The murmur rather grew than increased when it was seen that he was swimming, not towards the steamer, but away from it, and that he was alone. Where was Mr. Sabin? A slight cry from behind diverted attention for a moment from the bobbing head. Mrs. Watson, who had heard the murmurs, was lying in a dead faint across a chair. One of the women moved to her side. The others resumed their watch upon events. A boat was already lowered. Acting upon instructions from the captain, the crew combined a search for the missing man with a leisurely pursuit of the fugitive one. The first lieutenant stood up in the gunwale with a hook in his hand, looking from right to left, and the men pulled with slow, even strokes. But nowhere was there any sign of Mr. Sabin. The man who was swimming was now almost out of sight, and the first lieutenant, who was in command of the little search party, reluctantly gave orders for the quickening of his men's stroke. But almost as the men bent to their work, a curious thing happened. The fugitive, who had been swimming at a great pace, suddenly threw up his arms and disappeared. "He's done, by Jove!" exclaimed the lieutenant. "Row hard, you chaps. We must catch him when he rises."