Those were, indeed, moments of greatest tension, away upon that dark wintry sea beyond the harbour, that wide bay which, on account of its unusual depth and exposed position, was never considered a very safe anchorage. Their progress seemed at a snail's pace, as it always seems upon the sea at night. They watched the pinnace draw up, and they knew that the man, Benyon, who, though German-born, had lived in London the greater part of his life--was on board carrying that terrible instrument of death that had been cleverly prepared in such official guise. At last--after an age it seemed--the boat swung in beside the lighted gangway against the pinnace, and Kennedy, stepping nimbly up, said to the sentry on board: "Let nobody pass up or down, except this lady." Then, seeing the officer on duty, he asked if a lieutenant had arrived on board with a despatch-box. "Yes. I've sent him down to the captain," was the reply. "Take me to the captain at once, please," Kennedy said in a calm voice. "There's no time to lose. There's treachery on board!" In a second the officer was on the alert and ran down the stern gangway which led direct to the captain's comfortable cabin, with its easy-chairs covered with bright chintzes like the small drawing-room of a country house. Kennedy followed with Ella, but the captain was not there. The sentry said he was in the ward-room, therefore the pair waited till he came forward eagerly. "Well," asked the grey-haired captain with some surprise, seeing an officer and a lady. "What is it?" "Have you received any despatches to-night, sir?" Kennedy inquired. "No. What despatches?" asked the captain. Then, in a few brief words, Kennedy explained how he had watched a man in naval uniform come off in the pinnace, carrying a heavy despatch-box. The man had passed the sentry and been directed below by the officer on duty. But he had never arrived at the captain's cabin. The "owner," as the captain of a cruiser is often called by his brother officers, was instantly on the alert. The alarm was given, and the ship was at once thoroughly searched, especially the ammunition stores, where, in the flat close to the torpedoes on the port side, the deadly box was discovered. The guests knew nothing of this activity on the lower deck, but the two men who found the box heard a curious ticking within, and without a second's delay brought it up and heaved it overboard. Then again the boatswain piped, and every man, as he stood at his post, was informed that a spy who had attempted to blow up the ship was still on board. Indeed, as "Number One," otherwise the first lieutenant, was addressing them a great column of water rose from an explosion deep below the surface, and much of it fell heavily on deck.