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into the antecedents of this lieutenant of Northumberland Fusiliers. I found that his friends lived at Morpeth, that he had been taken prisoner during the Loos advance of September 1915, and that he had died about a year later of typhoid fever in a German camp. His friends, as soon as they had been informed, of the death, had stopped sending parcels of food out to him. They were not told the object of the inquiries. It would have caused them needless pain. It was bad enough that their only son had died far from home in a filthy German prison."

      Dawson's rather metallic voice became almost sympathetic, and I was pleased to observe that his harsh profession had not destroyed in him all human feeling.

      "After this you may suppose that the parcels addressed to our poor friend the late lieutenant were very eagerly looked for. The alleged sender, whose name and residence were written upon the labels, was found not to exist. Both name and address were false. It was a hot scent, and I was delighted, after a week of waiting, to see another parcel come in. This would, in all probability, contain the 'important naval news,' and I took its examination upon myself. I reduced the bread and the chocolate to powder without finding anything."

      "Excuse me," I cried, intensely interested, "but how could one conceal a paper in bread or in chocolate without leaving external traces?"

      "There is no difficulty. The loaves were of the kind which have soft ends. One cuts a deep slit, inserts the paper, closes up the cut with a little fresh dough, and rebakes the loaf for a short time, till all signs of the cut have disappeared. The chocolate was in eggs, not in bars. The oval lumps can be cut open, scooped out, a paper put in, and the two halves joined up and the cut concealed by means of a strong mixture of chocolate paste and white of egg. When thoroughly dried in a warm place, chocolate thus treated will stand very close scrutiny. I did not trouble to look for signs of disturbance in either loaves or eggs; it was quicker and easier to break them up. I then addressed my attention to the sardine tins, which from the first had seemed the most likely hiding-places. A very moderately skilled mechanic can unsolder a tin, empty out the fish and oil, put in what he pleases in place, weight judiciously, and then refasten with fresh solder. I opened all the tins, found that all except one had been undisturbed, but that one was a blissful reward for all my trouble, for in it was a tightly packed mass of glazier's putty, soft and heavy, and at the bottom the carefully folded paper which I have now the honour of showing to you."

      Dawson handed me a stiff piece of paper, slimy to the touch and smelling strongly of white lead. Upon it were two neatly made drawings and some lines of words and figures. "It is just what I should have expected," said I.

      "You recognise it?"

      "Of course," said I. "We have here a deck plan showing the disposition of guns, and a section plan showing arrangement of armour, of one of the big new ships which has been completed for the Grand Fleet. Below we have the number and calibre of the guns, the thickness and extent of the armour, the length, breadth, and depth of the vessel, her tonnage, her horse power, and her estimated speed. Everything is correct except the speed, which I happen to know is considerably greater than the figure set down."

      "You have not by any chance seen that paper before?" asked Dawson, with rather a forced air of indifference.

      "This? No. Why?"

      "I was curious, that's all." He looked at me with a queer, quizzical expression, and then laughed softly. "You will understand my question directly, but for the moment let us get on. What sort of person should you say made those drawings and wrote that description?"

      I am no Sherlock Holmes; but any one who has had some acquaintance with engineers and their handiwork can recognise the professional touch.

      "These drawings are the work of a trained draughtsman, and the writing is that of a draughtsman. One can tell by the neatness and the technique of the shading."

      "Right first time," said Dawson approvingly. "At present I have that draughtsman comfortably locked up; we picked him out of the drawing office at——" he named a famous yard in which had been built one of the ships of the class illustrated upon the paper in my hands.

      "Poor devil," I said. "What is the cause—drink, women, or the pressure of high prices and a large family?"

      "None of them. His employers give him the best of characters, he gets good pay, is a man over military age, and has, so far as the police can learn, no special embarrassments. He owns his house, and has two or three hundred pounds in the War Loan."

      "Then why in the name of wonder has the schweinehund sold his country?"

      "He declares that he never received a penny for supplying the information upon that paper, and we have no evidence of any outside payments to him. He did not attempt to conceal his handwriting, and when I made inquiries of his firm, he owned up at once that the paper was his work. He said that for years past he had given particulars of ships under construction to the same parties as on this occasion. He admitted that to do so was contrary to regulations, especially in wartime, but thought that under the circumstances he was doing no harm. I am not exactly a credulous person, and I have heard some tall stories in my time, but for once I am inclined to believe that the man is speaking the truth. I believe that he received no money, and was acting throughout in good faith."

      "I am more and more puzzled. What in the world can the circumstances be which could induce an experienced middle-aged man, employed in highly confidential work in a great shipyard, not only to break faith and lose his job, but to stick his neck into a rope and his feet on the drop of a gallows. Reveal the mystery."

      "You are sure that you have never seen that paper before?" asked

       Dawson again, this time slowly and deliberately.

      "Of course not!" I said. "How could I?"

      "That is just what I have to find out," said Dawson. He stopped, took out a knife, prodded his nearly smoked cigar, puffed once or twice hard to restore the draught, and spoke. "That is what interests me just now. For, you see, this very indiscreet and reprehensible swinehound of a draughtsman, who is at present in my lockup, declares that he was without suspicion of serious wrong-doing, because—because—the particulars of the new battleship upon that paper were supplied to YOU."

       Table of Contents

      AN INQUISITION

      Perhaps I ought to have seen it coming, but I didn't. For a moment, as a washerwoman might say, I was struck all of a heap. Then the delicious thought that I—by nature a vagabond, though by decree of the High Gods the father of a family and a Justice of the Peace—had to face the charge of being a German spy shook my soul with ribald laughter. I had been dull and torpid before the arrival of Dawson; he had awakened me into joyous life. I arose, filled and lighted a large calabash pipe, and passed a box of cigars to the detective. "Throw that stump away and take another," said I. "I owe you more than a cigar or two." He stared at me, took what I offered, and his face relaxed into a grin. "It is pleasant to see that you are a man of humour, Mr. Dawson," I observed, when we were again seated comfortably on opposite sides of the fire. "In my day I have played many parts, but I cannot somehow recall the incident of unsoldering a sardine tin, inserting a paper packed in a mess of putty, soldering it up, and despatching the incriminating product within a parcel addressed to a late lieutenant of Northumberland Fusiliers. I am not denying the charge; the whole affair is too delightful to be cut short. Let us spin it out delicately like children over plates of sweet pudding."

      "You are a queer customer, Mr. Copplestone. I confess that the whole business puzzles me, though you and your friends here seem to find it devilish amusing. When I told the Chief Constable, the manager of the shipyard, and the Admiral Superintendent of Naval Work that you were the guilty party, they all roared. For some reason the Admiral and the shipyard manager kept winking at one another and gurgling till I thought they would have choked. What is the joke?"

      "If you are good, Dawson, I will tell you some day.

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