With such an obscure book as the key to the cipher there was no need for any further elaborate precautions, and we hit upon the solution of the difficulty at once. On page 123 the eighth letter on the fifth line was "B;" on page 27 the sixth letter in the thirty-second line was "r"; and in a few minutes I had decoded the word "Brixton." Going on, I found that the message conveyed the news that Number 24,--Road, Brixton, had been wrecked by one of the bombs dropped in the recent raid; that a man, a woman, and two children had been killed. The spots where the other bombs had fallen were accurately described, and it was stated that they had done no damage beyond blowing holes in the roads and bursting gas and water mains. Every word was accurate. And the key to the whole problem was the mysterious advertisement for a lost trinket in the _Petit Parisien_. That simple advertisement, so apparently innocent, had announced to Blind Heinrich the enemy's change of code! And without the book to which it referred no intelligence on earth could have deciphered the disorderly mass of figures which lay before our eyes! "Well, I think we have got them now, Captain," I said, "and I am sure the Government will be deeply obliged to you for your assistance. But how am I going to get this fellow? If he lands in Norway he will be out of our power." "Come on deck," said Captain Jackson, with a laugh. "Don't make your mind uneasy about that." I followed him up the companion-way ladder to the deck, now deserted by all save the steersman and the officer on watch. "Come up to the bridge with me," said the Captain. Although it was so near the period of full moon the night was dark, the sky being covered by a dense mass of heavy clouds. Try as we would, our eyes could not pierce the gloom, and we could see nothing a few yards from the ship. Though we had parted company from the destroyers long before, we were, of course, travelling without lights in view of possible danger, and only the binnacle lamp shed a soft radiance on the ship's compass. I was soon to learn, however, how closely we were watched. Captain Jackson entered the wheel-house and touched a key. From the masthead above a signal lamp flashed intermittently for a few seconds. Instantly from the southward winked an answering gleam, and Captain Jackson turned to me. "That's a destroyer," he said, "and she is coming up full speed." For the next few minutes signals were exchanged with the racing destroyer which was on our track, and soon I caught sight of the faint glow from her funnels, and then the outline of her low, rakish hull as she came abreast with us. At a signal from Captain Jackson our engines stopped, and soon we were lying motionless while a boat from the destroyer pulled rapidly across the gap which separated the two vessels.