"Very well," I said. "I shall escort Mr Gray to Baker Street immediately." I glanced at the wreckage of the submersible. "But what of this?"

"Oh, don't worry yourself with that, Dr Watson. I'll send for Sir Charles Bainbridge of Scotland Yard. His men will know what to do with the remains of this most remarkable contraption."

"Bainbridge?" I said, with a smile. "Then we have a mutual acquaintance." I'd worked with Bainbridge almost fifteen years earlier, during the Hans Gerber affair, and again on a number of other occasions during the intervening years. He was a good man, and an even better police inspector.

Newbury laughed again. "I'll be sure to give him your regards," he said. "Now, Doctor. Let us find you a cab. It's late, and we still have much to do. Our answers can wait until tomorrow."

"Very well," I said, helping Xavier Gray to his feet. "If you'll come quietly?"

The man nodded, hanging his head. "I will," he said, morosely. I decided to take him at his word, although I kept my revolver close at hand, just to be sure.

It was late when we arrived at Baker Street, gone midnight, but I was resolved to rouse Holmes from his bed. We'd pa.s.sed the journey across town in silence, with just the creak of the carriage wheels and the clatter of horse's hooves to punctuate our journey.

Xavier Gray had remained slumped in the opposite corner of the hansom throughout, as if the life had simply gone out of him. I couldn't help feeling pity for the man, despite the events of the previous evening. I did not then know the nature of the horror that plagued him, but all the same I had some sense that he was carrying an enormous burden upon his shoulders. I decided not to press the matter, and respected his need for silence. Tomorrow, I would push for answers. Tonight I was close to exhaustion, and couldn't bring myself to coerce such a clearly disturbed man.

It was a bleary-eyed Mrs Hudson who came to the door of 221b, wrapped in a black shawl and wearing an exasperated expression. "Oh, Dr Watson. It's you."

"Indeed it is, Mrs Hudson. Please, forgive me for disturbing you at this unsociable hour."

Mrs Hudson gave me a resigned look. "And you think I'm not used to such shenanigans, Doctor? You did, after all, live with Mr Holmes for a number of years."

I grinned. "Is he home?"

"G.o.d knows," she said, with a shrug of her shoulders. "But I suppose you'd better come in. Your guest looks as if he's about to catch his death."

I decided not to disabuse Mrs Hudson of the notion that Gray was my guest. It wouldn't do to concern her with the truth that I was leading a wanted man - and a criminal, at that - into her home.

It soon became clear that Holmes was not, after all, at home. Nevertheless, there was little I could do but wait. I ushered Gray into the drawing room and convinced Mrs Hudson to return to her bed. I poured myself a whisky, deciding it would steady my nerves, and built up the fire in order to banish the chill.

All the while I kept my revolver close at hand, but Gray remained largely silent and subdued.

We'd been there for less than half an hour when I heard a key sc.r.a.pe in the lock downstairs. Footsteps followed on the creaking treads, accompanied by a gaily sung melody, "Tra, la, la, la, la." The footsteps halted outside the door. "h.e.l.lo, Watson!" said Holmes, breezily, before the door had even been opened.

Of course, this was not a difficult deduction. Holmes knew Mrs Hudson's habits well, and that she would already be in bed. She would not have allowed anyone other than I to wait here for Holmes, and since it was evident that someone inhabited the drawing room-probably from the spill of light beneath the door -it had to be me.

The door swung open and Holmes' beaming face appeared in the opening. He was wrapped in a dark brown cape and was wearing a top hat. "Ah, I see you have a visitor?" he said, removing his hat and strolling boldly into the room.

I stood. "Indeed I do." I indicated the sorry specimen crumpled in the chair opposite. "This, Holmes, is Mr Xavier Gray."

Holmes looked from one of us to the other with a wide-eyed expression. "I... well... is it really, Watson?"

Xavier Gray glanced up at Holmes. "Dr Watson is correct, Mr Holmes. I am indeed Mr Xavier Gray," he said, his voice low and moribund.

"How extraordinary," said Holmes, "How very extraordinary." He seemed genuinely surprised by this development. He stroked his chin thoughtfully. "This business with the unusual beast?" he asked, after a short moment of reflection.

"Quite so," I said, proudly. "You were wrong to dismiss it, Holmes. It's proved to be the most remarkable of cases. The beast was in fact a bizarre, amphibious submersible being piloted by Mr Gray."

"Indeed?" said Holmes, without even a flicker of irony. "Well, perhaps I was wrong to be so dismissive, Watson. If it wasn't for your tenacity..."

"Don't mention it, Holmes," I said, with a smile. "So what now? I'm afraid we haven't questioned him yet regarding his motives. I fear he's rather in the grip of a severe case of shock."

Holmes nodded. "Very good, Watson. If I could prevail on for you for a short while longer, I'll send for Mycroft immediately. Of course, you're welcome to the spare room this evening, if you should wish it?"

The thought of my old bed reminded me of just how tired I was. By this time it was almost two o'clock in the morning. "Thank you, Holmes," I said, nodding in grat.i.tude. "The spare room will be most appreciated."

I waited with Gray while Holmes bustled off to make the necessary arrangements. He returned a few minutes later, looking rather pleased with himself. "Mycroft will be here shortly. Now, Watson, if you'd be kind enough to pour Mr Gray a brandy?"

"What was that?" I said, somewhat startled. I'd been dangerously close to drifting off before the fire.

"A drink for Mr Gray, Watson. Make it a substantial one."

With a sigh, I pushed myself out of my chair and crossed to the sideboard. When I turned back a moment later, gla.s.s in hand, I was annoyed to see Holmes had helped himself to my seat, opposite our visitor.

"Mr Gray, I should like to talk with you," said Holmes, his voice low and even.

Gray seemed not to hear his words, or otherwise chose not to engage with them.

Holmes leaned forward in his - or rather, in my - chair. "I know what became of your family, Mr Gray."

At this the other man's demeanour seemed to alter entirely. He stiffened, lifting his head to stare directly at Holmes, who smiled calmly and waved at me to deliver the brandy. I placed it on the side table close to where Gray was sitting and retreated, moving round to stand behind Holmes.

"I didn't kill them," Gray said, gritting his teeth, and I was startled to see tears forming in the corners of his eyes as he spoke. His fists were bunched so hard by his sides that his nails were digging into the flesh of his palms, drawing little beads of blood. "Despite what they might say I only wanted to protect them."

"I believe you," said Holmes, levelly "It was immediately clear to me upon examining their remains that you were not to blame. Rather, it was the work of a criminal organisation, a network of thieves and robbers known as the Order of the Red Hand. All of their typical hallmarks were in evidence." He paused, as if weighing up his own words. "I'm very sorry for your loss," he added, almost as an afterthought.

Xavier Gray reached shakily for the tumbler of brandy I had provided for him and drained it thirstily, shuddering as the alcohol did its work. He returned the empty gla.s.s to the table, wiping his mouth with the back of his hand. "I tried to save them," he said, and his eyes implored us to believe him. "I tried to help. But I wasn't strong enough. I couldn't stop them. They held me back while they did it. They made me watch." He began to weep openly then, tears trickling down his pale cheeks. "And all for what? For a few measly pounds. I only wish they'd killed me, too. Then I wouldn't have to live with the memory."

Unsure of what else I could do, I collected his gla.s.s and poured him another generous measure. The story unfolding before me was not at all what I had expected.

"And so you decided to take matters into your own hands?" prompted Holmes, leaning back in his chair and making a steeple with his fingers.

"I didn't know what else to do," said Gray between sobs. "It was all I could think of. All of those machines, those weapons, just hidden there in storage, covered in dusty tarpaulin. No one would know. Those ruffians needed to pay for what they'd done."

Confused, I glanced at Holmes, who shook his head minutely to indicate that I should refrain from interjecting with any questions.

"So you took the submersible and set about searching for the perpetrators of the crime?"

Gray nodded. "Yes. I knew they wouldn't lie low for long. People like that never do. And so I made my nightly excursions in the stolen submersible, hoping to find them."

"In the very same location where your own family perished at their hands?"

Gray nodded. "Cheyne Walk. That's where they set upon us. I pleaded with them to stop. I tried to reason with them. I promised to give them everything if only they would spare the lives of my wife and children. But it was as if they were punishing me for only having a few pounds in my wallet. They wanted to make me pay, one way or another. And so I wanted to make them pay in return."

"It would never have been enough," said Holmes. "You would never have been able to live with yourself."

"You think I can live with myself now?" said Gray, burying his face in his hands. "I have nothing left to live for."

I hardly knew what to say or do. I'd seen men like this before, broken because of a grave loss. It was clear that Gray had been driven to do what he had because of grief, and that temporary, blinding madness it inspires.

I was still somewhat unsure of the full picture, but in listening to the conversation I had managed to piece together something of the story It seemed to me that Xavier Gray had been the victim of a terrible, random crime, and that a gang of thieves had set upon him and his family in the street. His family had been brutally murdered before his very eyes, and as a consequence his mind had snapped. He had stolen the experimental submersible from - I a.s.sumed - the government facility where he worked, and had set out to seek revenge. It was a shocking tale, and I felt no small measure of pity for the wretch. I cannot say I wouldn't have done the same in his circ.u.mstance.

I jumped at the sound of a cane rapping against the front door, down in the street below.

"Mycroft," said Holmes, leaping out of his seat and disappearing to welcome his brother.

We remained silent for a moment. I heard Mycroft bustling into the hallway downstairs. "I'm sorry," I said to Gray, watching as he downed the remains of his second brandy.

"So am I," he replied, and I knew the words were not really intended for me.

Mycroft entered the room then, ahead of Holmes, and I once again found myself taken aback by the sheer presence of the man. He was heavyset, with an ample waist and a broad, barrel-like chest, and taller even than his brother. He looked decidedly put out at finding himself there at Baker Street at nearly three o'clock in the morning, and his forehead was furrowed in a deep frown.

"Watson," he said, levelly, by way of greeting. "I understand my thanks are in order?" His tone was business-like and clipped.

I smiled and gave the briefest of shrugs. "You're welcome," I said. "I did only what I felt was necessary"

"You did me a great service," said Mycroft, quickly, before turning to Gray, who was still sitting in the armchair opposite, clutching an empty gla.s.s. "Come along, Gray. It's over now."

Xavier Gray looked up to meet Mycroft's intense gaze. "Is it?" he asked, softly, before placing his gla.s.s on the side table and getting to his feet. "I don't think it shall ever be over."

Mycroft didn't respond, other than to place a firm hand on Gray's shoulder and to steer him swiftly towards the door. "Good night, Dr Watson," he said, without glancing back. "Until next time."

Holmes saw his brother and his charge into their waiting carriage, before returning to the drawing room, a sullen expression on his face. "A dark business, Watson," he said, quietly "A dark business indeed."

"I'm just pleased that it's over," I said, stifling a yawn.

"Oh, I think for Mr Xavier Gray, Watson, the pain is only just beginning."

On that note, I repaired to my old room with a heavy heart, intent on a long and restful sleep.

The next morning I arose late to find Holmes had been up and about for hours. Indeed, I had my suspicions that, as I knew he was wont to do, he had not visited his bed at all.

"Ah, Watson!" he said jovially as I poked my head around the drawing room door. He was sitting with the morning newspapers, snipping away with a pair of silver scissors, taking cuttings for his sc.r.a.pbooks.

"Morning, Holmes," I said, somewhat taken aback by his jollity "Come and sit down, Watson! We'll have Mrs Hudson rustle you up a late breakfast." The thought was most appealing.

"Tell me, Holmes, have you had word from Mycroft?"

Holmes nodded. "Indeed I have, Watson." He returned to his clippings.

"And?" I prompted, exasperated.

He glanced up from The Times with a mildly confused expression.

"Xavier Gray?" I said. "There are those of us still anxious to understand his story," I said, taking a seat opposite him. "As well as your role in the matter," I added, for in truth that was my real motivation.

Holmes set down his scissors. "Ah, yes. Of course. Xavier Gray, Watson, was a government scientist and spy. He was working on a number of highly sensitive projects in the area of mechanised warfare, when, a week ago, he suddenly disappeared."

"Disappeared?" I echoed.

"Quite so," replied Holmes. "His superiors were, of course, concerned for the man, and even more for the sensitive information he was party to. Had he defected? Had he been captured and taken prisoner? The usual means of investigation turned up nothing. His home had simply been abandoned, and his family were gone, too."

"And now we know why," I said, gravely.

"Indeed. But at the time, the men responsible for tracing him had been unable to turn up any evidence of where he might have gone. Mycroft feared he might have fled somewhere untraceable in order to sell his secrets to a foreign agency, taking his family with him. In desperation, he called on me to investigate."

"And?"

"I soon discovered what the others had, of course, missed. Gray's family-his wife and two young boys-had been horrifically murdered just days prior to his disappearance. It appeared to be the work of the criminal gang I spoke of, The Order of the Red Hand, a network of robbers and thieves who had set upon them in the street and cleared out their pockets before disappearing. The bodies were still lying unidentified in the morgue."

"But why did Gray believe he was under suspicion? Last night he was most anxious to clear his name when you raised the matter."

"Once I had discovered the truth about his family, the imbeciles at the Yard were quick to proclaim his guilt, despite my evidence to the contrary. They simply could not fathom why a man might flee in the aftermath of such harrowing events, unless he was himself the killer or somehow connected with the perpetrators."

"That's preposterous!" I said.

Holmes laughed. "An all-too-familiar story, I fear, Watson."

"One can hardly blame him for taking matters into his own hands when faced with that as an alternative. I should imagine any man in his position might have chosen to do the same."

"Grief drives people to do terrible things, Watson, as you well know."

"Indeed," I said, quietly. "What will happen to Gray now?"

"Most likely an inst.i.tution, I'd wager. At least until he's had time to recover from the shock and torment that drove him to such extreme ends."

"Extreme ends indeed. I can only imagine that, when he attacked Sir Maurice, Miss Hobbes and I, he'd mistaken us for the very same criminals who had attacked and killed his family. Particularly when Newbury tossed a flare in his direction."

"I believe you'd be safe in that a.s.sumption," said Holmes. "I imagine he saw only what his shattered mind had conjured."

"And what of the Order of the Red Hand?"

"Ah," said Holmes, brightly. "Their story is far from over. We shall face the Order of the Red Hand again. I am sure of it."

"I have no doubt you're right," I said, knowingly. "Well, that's an end to a remarkable sequence of events, Holmes," I continued, with a sigh. "And a most satisfactory resolution. For both of us."

"Indeed," said Holmes, rising from his seat and crossing to the fireplace to search for his pipe and Persian slipper. "I believe the old adage, Watson, is 'to kill two birds with one stone.'"

"Quite so," I agreed. "It is almost as if..." I paused, hesitating to give voice to a nagging doubt that had been plaguing me since I'd woken that morning. "It is almost as if someone masterminded the entire thing."

"Really, Watson?" said Holmes, laughing. "You do have a tendency towards the fanciful."

"Hmm," I replied. "So where were you last night while all of the excitement was going on?"

Holmes smiled, returning to his seat and beginning to meticulously stuff the bowl of his pipe with s.h.a.g. "A violin concerto. German. It was quite exquisite, Watson. The company was only in London for one night. It was truly not to be missed. Not under any circ.u.mstances."