of my mind. When one has lived much among foreign peoples, one's mentality slips automatically into their skin. I was now thinking in German—at least so it seems to me when I look back upon that night—and I answered without reflecting.

"I don't care where it is as long as I can get somewhere to sleep out of this infernal rain!"

"The gentleman can have a good, clean bed at the Hotel Sixt in the little street they call the Vos in't Tuintje, on the canal behind the Bourse. The proprietress is a good German, jawohl ... Frau Anna Schratt her name is. The gentleman need only say he comes from Franz at the Bopparder Hof."

I gave the man a gulden and bade him get me a cab.

It was still pouring. As we rattled away over the glistening cobble-stones, my mind travelled back over the startling events of the day. My talk with old Dicky had given me such a mental jar that I found it at first wellnigh impossible to concentrate my thoughts. That's the worst of shell-shock. You think you are cured, you feel fit and well, and then suddenly the machinery of your mind checks and halts and creaks. Ever since I had left hospital convalescent after being wounded on the Somme ("gunshot wound in head and cerebral concussion" the doctors called it), I had trained myself, whenever my brain was en panne, to go back to the beginning of things and work slowly up to the present by methodical stages.

Let's see then—I was "boarded" at Millbank and got three months' leave; then I did a month in the Little Johns' bungalow in Cornwall. There I got the letter from Dicky Allerton, who, before the war, had been in partnership with my brother Francis in the motor business at Coventry. Dicky had been with the Naval Division at Antwerp and was interned with the rest of the crowd when they crossed the Dutch frontier in those disastrous days of October, 1914.

Dicky wrote from Groningen, just a line. Now that I was on leave, if I were fit to travel, would I come to Groningen and see him? "I have had a curious communication which seems to have to do with poor Francis," he added. That was all.

My brain was still halting, so I turned to Francis. Here again I had to go back. Francis, rejected on all sides for active service, owing to what he scornfully used to call "the shirkers' ailment, varicose veins," had flatly declined to carry on with his motor business after Dicky had joined up, although their firm was doing government work. Finally, he had vanished into the maw of the War Office and all I knew was that he was "something on the Intelligence." More than this not even he would tell me, and when he finally disappeared from London, just about the time that I was popping the parapet with my battalion at Neuve Chapelle, he left me his London chambers as his only address for letters.

Ah! now it was all coming back—Francis' infrequent letters to me about nothing at all, then his will, forwarded to me for safe keeping when I was home on leave last Christmas, and after that, silence. Not another letter, not a word about him, not a shred of information. He had utterly vanished.

I remembered my frantic inquiries, my vain visits to the War Office, my perplexity at the imperturbable silence of the various officials I importuned for news of my poor brother. Then there was that lunch at the Bath Club with Sonny Martin of the Heavies and a friend of his, some kind of staff captain in red tabs. I don't think I heard his name, but I know he was at the War Office, and presently over our cigars and coffee I laid before him the mysterious facts about my brother's case.

"Perhaps you knew Francis?" I said in conclusion. "Yes," he replied, "I know him well." "Know him," I repeated, "know him then ... then you think ... you have reason to believe he is still alive...?"

Red Tabs cocked his eye at the gilded cornice of the ceiling and blew a ring from his cigar. But he said nothing.

I persisted with my questions but it was of no avail. Red Tabs only laughed and said: "I know nothing at all except that your brother is a most delightful fellow with all your own love of getting his own way."

Then Sonny Martin, who is the perfection of tact and diplomacy—probably on that account he failed for the Diplomatic—chipped in with an anecdote about a man who was rating the waiter at an adjoining table, and I held my peace. But as Red Tabs rose to go, a little later, he held my hand for a minute in his and with that curious look of his, said slowly and with meaning:

"When a nation is at war, officers on active service must occasionally disappear, sometimes in their country's interest, sometimes in their own."

He emphasised the words "on active service."

In a flash my eyes were opened. How blind I had been! Francis was in Germany.

CHAPTER II

THE CIPHER WITH THE INVOICE

Red Tabs' sphinx-like declaration was no riddle to me. I knew at once that Francis must be on secret service in the enemy's country and that country Germany. My brother's extraordinary knowledge of the Germans, their customs, life and dialects, rendered him ideally suitable for any such perilous mission. Francis always had an extraordinary talent for languages: he seemed to acquire them all without any mental effort, but in German he was supreme. During the year that he and I spent at Consistorial-Rat von Mayburg's house at Bonn, he rapidly outdistanced me, and though, at the end of our time, I could speak German like a German, Francis was able, in addition, to speak Bonn and Cologne patois like a native of those ancient cities—ay and he could drill a squad of recruits in their own language like the smartest Leutnant ever fledged from Gross-Lichterfelde.

He never had any difficulty in passing himself off as a German. Well I remember his delight when he was claimed as a fellow Rheinländer by a German officer we met, one summer before the war, combining golf with a little useful espionage at Cromer.

I don't think Francis had any ulterior motive in his study of German. He simply found he had this imitative faculty; philology had always interested him, so even after he had gone into the motor trade, he used to amuse himself on business trips to Germany by acquiring new dialects.

His German imitations were extraordinarily funny. One of his "star turns", was a noisy sitting of the Reichstag with speeches by Prince Bülow and August Bebel and "interruptions"; another, a patriotic oration by an old Prussian General at a Kaiser's birthday dinner. Francis had a marvellous faculty not only of seeming German, but even of almost looking like a German, so absolutely was he able to slip into the skin of the part.

Yet never in my wildest moments had I dreamt that he would try and get into Germany in war-time, into that land where every citizen is catalogued and pigeonholed from the cradle. But Red Tabs' oracular utterance had made everything clear to me. Why a mission to Germany would be the very thing that Francis would give his eyes to be allowed to attempt! Francis with his utter disregard of danger, his love of taking risks, his impish delight in taking a rise out of the stodgy Hun—why, if there were Englishmen brave enough to take chances of that kind, Francis would be the first to volunteer.

Yes, if Francis were on a mission anywhere it would be to Germany. But what prospect had he of ever returning—with the frontiers closed and ingress and egress practically barred even to pro-German neutrals? Many a night in the trenches I had a mental vision of Francis, so debonair and so fearless, facing a firing squad of Prussian privates.

From the day of the luncheon at the Bath Club to this very afternoon I had had no further inkling of my brother's whereabouts or fate. The authorities at home professed ignorance, as I knew, in duty bound, they would, and I had nothing to hang any theory on to until Dicky Allerton's letter came. Ashcroft at the F.O.