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I was on my hands and knees, aggressively scrubbing the kitchen linoleum. To be perfectly honest, during my years as an army doctor surviving Helmand, it hadn't once crossed my mind that my greatest adversary would turn out to be a stubborn chemical stain in a Marylebone flat. My shoulder gave a familiar twinge of protest as I attacked the floor.
Chemical. Yes—chemical. In the kitchen.
I had long since given up trying to identify what particular compound had created this grotesque mark. What mattered was that Mrs Hudson absolutely could not be allowed anywhere near it, and besides, her back was bad. A posture like this would certainly aggravate her condition. Of course, the most efficient solution would have been for the person actually responsible for this biohazard to clean it himself, but that seemed even less likely than spontaneous combustion.
"Sherlock."
Having conquered roughly half the stain, I straightened up and addressed my flatmate, who was sprawled across the sofa in the sitting room, fingertips steepled beneath his chin in his classic mind-palace pose.
"The cleanser Mrs Hudson left is in the cupboard beneath the extractor hood."
"Thanks. I see you're still not inclined to actually move and help."
He delivered this information in that flat, affectless tone of his. I shrugged and turned back to face the substantial stain that remained. With no reinforcements forthcoming, I would need fresh supplies to tackle this particular enemy. I peeled off my heavy rubber gloves and opened the cupboard Sherlock had indicated, in search of Mrs Hudson's secret weapon.
(I made it a point early on never to question why our flat's kitchen came equipped with a fully functional extractor hood, or why there was a thumb in the butter dish. I've learnt that a certain degree of selective blindness is essential for surviving 221B.)
The cupboard's interior was remarkably free of any signs of ordinary life. A few cobwebs, a new bottle of cleanser, and tucked further back, something wrapped in brown paper.
"What's this?"
I pulled it out into the cold fluorescent light. It appeared to be a bottle containing liquid. I tore away the paper rather carelessly, revealing a cork sealed with wax and a label bearing pretentious French script. This was unmistakably wine. And from the look of it, rather a good bottle.
"Sherlock. I've found a bottle of wine in the cupboard. Where on earth did this come from?"
In an ordinary household, finding wine in a kitchen cupboard would be perfectly normal—expected, even. But this particular kitchen, despite my most valiant efforts at resistance, had been transformed by my flatmate into something resembling a hazardous biochemical laboratory. Therefore, the ordinary presence of wine constituted an extraordinary event.
"Wine?" Sherlock glanced at the bottle I held out. "Ah. A memento from a rather curious case."
The self-proclaimed 'high-functioning sociopath'—the man who had turned our kitchen into a laboratory, our wall into a shooting range, and our mantelpiece (via jackknife) into a letter rack—gave the bottle barely a moment's attention before shaking his head dismissively, as though it were of no consequence whatsoever.
Ordinarily, I might have offered some sharp remark about his attitude. But the phrase curious case had caught my attention, and I found myself leaning forward despite myself.
"A curious case?"
"One I was involved with before we met."
"You mean from your early days? When you first started as a detective?"
"Yes. But it was nothing of significance. Now, hadn't you better return to your more productive cleaning?"
"Hold on. That's hardly fair, is it? I'm doing this because Mrs Hudson told you off, and you've left me to deal with the consequences. The least I deserve as payment for my labour is a story."
At my outburst, the corner of Sherlock's mouth twitched upward. I was well aware I'd taken the bait like a fish on a hook, but there was no turning back now.
"Pedestrian," Sherlock stated, not bothering to open his eyes. "An affluent pensioner from Banbury, poisoned at a London hotel. Murderer: her son. Motive: inheritance. Painfully tedious."
"Doesn't sound particularly curious to me."
I set my rubber gloves on the edge of the sink and settled into my own chair. Sherlock, meanwhile, shifted from his semi-recumbent position to sit properly upright, a satisfied gleam entering his eyes as he regarded me.
"Quite so. The conclusion itself was, as I said, simple and rather dull."
He paused, then continued with that infuriatingly smug expression of his.
"However, the actual events—as they unfolded—were exceedingly strange and baffling. Had you been present, you wouldn't have been able to make head nor tail of it."
"If you're so confident about that—" I said, somewhat nettled by his tone, "—then tell me about it. Let's see whether I really can't understand."
"What about the second stain on the kitchen floor?"
"Never mind the Second Stain, Sherlock. Just tell me about the case."
My interest had long since shifted from the floor to his story, and his belated concern for the cleaning only irritated me further. Yes, fine, I would indeed come to regret postponing the job—rather severely, as it turned out—but that's beside the point.
"The pensioner died during a private wine tasting. She began experiencing sudden distress during the event and died at hospital shortly after being transported there. Are you following?"
I nodded, and Sherlock pressed his fingertips together, proceeding to reel off the details of the case as fluently as if he had the file open before him.
"The deceased had converted her basement into an extensive wine cellar and invested heavily in wine. It was quite an operation. Apparently, during the London Blitz in the Second World War, the Charing Cross bank vault where she had deposited her entire fortune was completely destroyed by fire. From that moment on, she lost all faith in paper currency. Instead, she converted the bulk of her wealth into precious metals, artwork, and wine."
"Diversified portfolio. Sensible woman," I remarked without thinking.
Sherlock gave a slight shrug.
"Your charitable interpretation isn't entirely wrong, but in this instance, it was rather more pathological. Those who pursue such eccentric investment strategies tend to share certain characteristics: they're invariably difficult, conservative, deeply suspicious, and miserly. Our victim exemplified every one of these traits. She trusted neither rating agencies nor experts. Every wine destined for her cellar had to be personally tasted and approved by her own palate. But that year, she was unable to make that judgement. Because one of the wines at the tasting had been laced with poison. Sodium cyanide. Scotland Yard quickly apprehended the culprits: the pensioner's younger son and her elder son's wife. The pair were having an affair. The marriage between the elder son and his wife had grown cold, and divorce was naturally under consideration. But the old lady had opposed it vehemently. To a woman of her conservative sensibilities, adultery within the family followed by divorce was an intolerable disgrace."
"So the adulterous couple conspired to poison her together. I still don't see what's curious about it."
"The pensioner's cause of death was acute arsenic poisoning."
"...Sorry?"
My jaw must have dropped, because Sherlock's eyes sparkled with mischief.
"Acute arsenic poisoning, John. The poison placed in the wine did not match the poison that killed her. And the arsenic—the actual murder weapon—was found nowhere except in her body and her vomit."
"So you're saying the victim never touched the poisoned wine, yet died from a different poison entirely. And no one knows where the fatal dose came from... That is, I'll admit, rather odd."
What Sherlock had described did indeed beggar belief. The poison at the scene didn't match the cause of death, and the victim hadn't even drunk the tainted wine. It sounded like something from an overwrought television thriller. Thoroughly hooked now, I leaned forward and demanded to hear more.
"So how did you solve it?"
"As I said—it was quite simple."
"It doesn't seem simple to me."
"That's because you're not using your head. Even from what I've told you, several deductions should present themselves. The killer, the motive, the actual source of the fatal poison."
He said this as though it were self-evident, but I remained utterly lost. Of course I did. He was a genius consulting detective; I was merely the chronicler. There was no reason to expect I could match his reasoning from the same data.
"Look, Sherlock. Please. Walk me through it properly. Just giving me the answer doesn't help—it only confuses things."
To my relief, he acceded without argument.
"Very well. Let me present the relevant facts in chronological order. Those present at the tasting were: the deceased; her elder son, a banker in the City; his wife, from whom he was emotionally estranged; the younger son, who worked for a chemical company and was, as noted, his sister-in-law's lover; a young sommelier hired for the occasion; and, waiting in an adjoining room due to the pensioner's poor health, her personal nurse. Six individuals in total. Hotel staff had prepared the food and tidied the room beforehand, but you may disregard them."
"The tasting proceeded more or less as planned. On the table were several bottles of new vintage wines, along with nuts, dried figs, raisins, salami, and sliced baguette. I should note that none of these contained arsenic. And as the younger son later confessed, the sodium cyanide had been placed in only one bottle of wine."
"Towards the end of the tasting, the pensioner suddenly began to show signs of distress. Initially, the others were merely startled, but led by the nurse—who had been alerted by the commotion—they soon began administering first aid. Despite their efforts, her condition deteriorated rapidly. An ambulance was called, and she was rushed to hospital, where she died that same day."
"The culprits were arrested almost immediately. The younger son, overcome with remorse at witnessing his mother's suffering, confessed to conspiring with his brother's wife to administer the poison. The wife, arrested shortly thereafter, confirmed their guilt. Neither showed any sign of protecting another party. It appeared the case was closed. But then they stated that the poison they had used was sodium cyanide. The tainted bottle was indeed recovered. However, the post-mortem revealed that the victim had died of arsenic poisoning. The pensioner had skipped breakfast that morning, meaning everything she had consumed came from the tasting. The nurse was also investigated, but there was no evidence that she had injected anything or administered any substance under the guise of medication. It was this bizarre set of circumstances that prompted Lestrade to contact me. That's the sequence of events. Have you worked anything out?"
"Only that I haven't the faintest idea what's going on," I admitted, slumping back in my chair.
I had listened carefully, but my modest intellect couldn't discern even the first thread of a solution, let alone the full picture. Perhaps taking pity on me in his own way, Sherlock spoke again in the manner of a maths teacher offering a hint to a struggling pupil.
"Set aside everything except the essential information. The moment the poison was administered is obvious. It was triggered by a simple accident. Perhaps 'accident' is too strong—it's a common enough hazard for the elderly, really quite an everyday occurrence. John. Think about what was on that table. The victim was old and had been unwell for some time. What might happen if such a person ate those items?"
Nuts, dried figs, raisins, salami, sliced baguette. Sherlock enumerated the items that would have been laid out. I forced myself to clear my mind of everything else and focused solely on finding a common thread. What would happen if an elderly person, weakened by illness, ate such things?
And then—suddenly—a vision crystallised in my mind.
"Of course! She choked. Elderly people produce less saliva and have weaker swallowing reflexes. Every single item on that table was dry and difficult to swallow!"
"Precisely. The pensioner choked—something lodged in her throat. Now, if you witnessed an elderly woman in such distress, what would you do?"
"Rub her back, or if necessary, pat it firmly to help her cough it up, give her some wa—" The word died on my lips as the horrifying method dawned on me. "Bloody hell."
"The true killer administered the fatal dose during the chaos of trying to 'help' the victim. Arsenic trioxide—the classic inheritance powder. Colourless, largely tasteless, and responsible for more aristocratic murders than any other substance in history. The moment she choked, he handed her a glass of water laced with a fatal dose. Arsenic trioxide is notoriously difficult to dissolve entirely in cold water, but in the panic of a choking fit, a desperate, gasping woman isn't going to notice a slight cloudiness in her glass, is she?"
My jaw tightened. I let Sherlock carry on, his voice a perfectly calibrated, clinical hum. Slipping poison to a choking, vulnerable pensioner in the guise of helping her—it was cowardly. My fists clenched against the arm of my chair.
"So who was it? Who's the killer?"
"Identifying exactly who gave her the water in all that confusion proved difficult. But it was quite straightforward to determine who had instructed that only dry foods be served. The pensioner's elder son and the sommelier he had hired. They, too, were having an affair."
"Right. Of course they were."
The tangled romantic arrangements of this family had now exceeded anything I might have imagined. If I recalled correctly, the initial suspects had been the younger son and the elder son's wife, who were also lovers. And the motive had centred on the wife's resentment at being prevented from divorcing...
"The husband was equally frustrated by his mother's interference. But the true culprits had a rather more pressing motive. The elder son had been embezzling from his bank. When this came to light, he was ordered to return the funds. Failure to do so within the deadline would result in criminal charges. It was at this critical juncture that he received some remarkable intelligence from his mistress—the sommelier."
"Remarkable intelligence?"
"One of the vintages stored in the pensioner's cellar had just broken the world record for wine prices at a Hong Kong auction."
Sherlock continued, looking profoundly bored.
"If the wine were sold now, it would easily raise more than enough to cover his debt. But the decision to sell lay with the owner—his mother. And even if she did sell, she would immediately reinvest the proceeds in more wine. To her, cash held no value whatsoever—merely portraits of the monarch printed on paper. And confessing his predicament to his mother was out of the question. A woman who opposed divorce with such ferocity would hardly look kindly upon embezzlement. The consequences didn't bear thinking about."
"So he conspired with his mistress to murder his own mother?"
"Yes. He knew his wife and brother were planning to kill her. He saw an opportunity to exploit their sloppy scheme and let them take the blame. He procured arsenic trioxide—most likely unearthing a rusted tin of Victorian-era weed killer from the depths of his mother's own neglected garden shed—and deliberately left it where the other two idiots could find it. Then, timing things to ensure he met his repayment deadline, he poisoned his mother himself. The moment she choked on the dry snacks, he administered the arsenic-laced water. In the ensuing chaos, he disposed of the glass and planted the same poison in one of the wine bottles. The sommelier's attempt to tamper with the wine apparently went awry, but that hardly mattered. The wife and brother, with their conspicuously amateurish murder plot, would naturally become the prime suspects."
"Except that the wife and brother had, by pure coincidence, chosen the same day to execute their own plan—using a completely different poison."
Sherlock nodded emphatically at my words.
"The elder son's great misfortune was that his wife was extraordinarily capricious and given to impulsive, shallow thinking. The reason she and the younger son moved the date forward? 'It seemed like a good opportunity.' The reason they abandoned the arsenic in favour of sodium cyanide pilfered from the younger son's chemical plant? Because 'it seemed more powerful.' Like children picking a shinier toy. They completely failed to consider that acute arsenic poisoning mimics a severe gastrointestinal illness—perfect for an ailing pensioner—while cyanide causes rapid, highly suspicious asphyxiation. Utterly, predictably absurd. And yet, it was precisely these impulsive decisions that unravelled the elder son's careful plan."
"I'd say marriage to that woman was the elder son's biggest mistake. Even setting aside the affairs, a couple so utterly incapable of communication was clearly doomed."
"And so concludes the tale of a foolish man who married the wrong woman. You said you couldn't understand a thing, but as I indicated at the outset, it was really quite simple, wasn't it?"
Yes. With two different poisons in play and the younger son and wife muddying the waters by assuming they were the killers, things had become rather convoluted. But once explained, it was hardly impenetrable. The motive was the prosaic 'inheritance.' The culprit was, as Sherlock had said from the start, 'the pensioner's son.' The method—'slipping poison into water under cover of chaos'—was nothing particularly elaborate.
Still, I wasn't quite ready to concede the point. My gaze fell upon the bottle of wine that had started this whole conversation.
"I'm sure it was all very simple for you. But even so—breaking innocent women's hearts in the course of an investigation really isn't on."
This, evidently, was not a response he had anticipated. Those pale, piercing eyes widened in genuine surprise, and the sight was so unexpected that I burst out laughing before I could stop myself.
"I mean the girl at the wine merchant's where you bought this. The sommelier was in on it, so she couldn't have told you about the auction. You got that from the shop girl, didn't you? Poor thing—completely taken in by you! I hope you at least told her afterwards that you weren't interested. You only make eyes at women when you've got an ulterior motive."
"How did you deduce that?"
It seemed I'd struck the mark dead centre. Sherlock's voice carried a note of genuine bewilderment, and I couldn't help but feel rather pleased with myself.
"You're particular about taste, but you're no expert on wine. You looked positively bored talking about it earlier. And if you had any real interest, you wouldn't have shoved this bottle in some forgotten corner of the kitchen and left it there. Someone taught you about the auction. The sommelier would never have divulged that, and even if she had, there'd be no reason for the wine to be here. You bought this during the investigation. You went to a wine shop—probably one that had some personal connection to the accomplice—and you charmed a young female shop assistant. Bought expensive wine you had no intention of drinking and pumped her for information while you were at it."
I reached into the crumpled brown paper that had wrapped the bottle and pulled out a small slip of paper, holding it up like a trophy.
"And the clincher? This. A mobile number jotted on the back of the receipt. Complete with a little biro heart."
Confronted with this damning evidence, Sherlock gave a low whistle and began to applaud with what appeared to be genuine admiration.
"Brilliant, John. Truly excellent reasoning."
I offered him a tight, deeply satisfied smile.
"Elementary, my dear Sherlock."