Esteemed Investigators,
We've now had some time to recuperate after The Mystery of the Mad Tea Parties. Hopefully, Madame Duval's gatherings continue to be remembered for less contentious reasons in the future.
As we await new cases, make sure to look over Holmes' thoughts on the Duval matter. Although you may have reached the same conclusions, his method is a sight to behold...
Looking forward to a calm end to the month,
The Dear Holmes Team
——
26 October 1901
My Dear Watson,
Your first letter reached me on a grey morning, when the Yorkshire air was thick with the sort of chill that sharpens both the lungs and the intellect. I had before me your account of Mrs. Hudson’s anxieties, the strange disturbances at Portman Square, and the troubling spectacle of respectable ladies crying out at empty corners and imagined whispers.
At first, I confess, I did not consider treachery but rather physiology.
Two women, at separate gatherings, separated by approximately a fortnight, afflicted by vivid distortions of perception. One saw figures where none stood. Another heard whispers where none sounded. Each episode was acute, dramatic, and temporary. No other guests appeared to succumb, yet the other guests did not quite act as expected– they were calm, scarcely disturbed by their friend’s actions. And no lasting malady followed.
From your account alone, three elements presented themselves for consideration: the room, the refreshments, and the personnel. The room appeared unremarkable. You noted no unusual odour, no choking vapour, no smoke or lamp. The biscuits were brought by Mrs. Mayfield herself; both Charlotte and the cook partook of the remnants and suffered nothing. We may therefore dismiss the ginger biscuits.
The tea, however, required closer scrutiny. You were careful— and I marked it at once— to record that Charlotte did not serve the tea. She placed the tray beside Madame Duval’s diary and withdrew. Madame poured the tea herself. Susan handled the food; and Madame, we are told, customarily drank coffee, not tea. It is a small domestic detail, but in such matters the domestic is often decisive. Control of the cups lay with Madame Duval.
Yet in that first letter, though the hand that poured was clear, no motive for poisoning her own guests was apparent. We must never leap to a conclusion without a motive to sustain it. I therefore set the matter aside, in expectation of further intelligence.
Your second communication, transmitted through Monsieur Locard, altered the landscape entirely. I read with interest his of excursion to Bromley, his fortuitous rescue of Duval, and his access to the man’s confidence. The aeronaut’s connection to a clandestine governmental project, thankfully confirmed by Mycroft’s intervention, was of immediate significance. That Duval had, however obliquely, mentioned this sensitive undertaking to three intimate friends was an act of indiscretion which might be exploited by one less scrupulous than he.
It was here that the name Edgar Halcombe first took on a sharper outline. Duval described him as “fascinating” and “beloved,” a Professor of Literature known for some six years. Nothing in that description suggests menace. Yet convivial wine loosens tongues, and at Frederic Songeur’s birthday some months past, Thomas Mayfield compared Halcombe’s appearance to an “old horse thief back in Newmarket.”
Men jest idly at many things; they do not idly choose so specific an image as a horse thief of a particular town. Newmarket is no obscure hamlet. It is synonymous with horses, racing, and all the attendant commerce of that world. A man formerly engaged in equine theft there might well carry some memory in the minds of those who once knew him.
If Halcombe were innocent, such a jest might sting his vanity and nothing more. But if he were not– if he were indeed that thief– then the remark would fall not as humour but as alarm.
Consider the timing. Duval confides, a month ago, in three friends: Songeur, Halcombe, Mayfield. Shortly thereafter, at gatherings attended by Mrs. Mayfield and Lady Stevens, whose social circles intersect closely with that same group, two women witness peculiar visions and sounds. And at those gatherings, as we learn later, the topic of conversation is directed toward childhood homes, travels, and in particular, Newmarket. This coincidence is too precise to be accidental. Even so, coincidence is not proof. I required more evidence before I could state my theory with certainty. Monsieur Locard’s visit to Portman Square, and his subsequent letter of 22 October, furnished it.
His description of Duval’s Orangerie surely delighted you for its horticultural richness; to me it was a catalogue of potential agents. He remarks upon the pungent scent of the chamber, the rare blooms, and most crucially, the presence of “unique varieties of thorn-apple” among the Solanaceae– recent additions, and tended personally by Madame Duval.
Thorn-apple, Watson, is no innocent ornament. Its properties have long been known. Even in modest quantities it can induce disturbances of sight and sound, agitation, delirium, and the loosening of rational restraint. The sufferer may perceive figures where none exist, hear sounds that have no source, and respond with terror to phantoms born of their own mind.
When Locard further observed the engraved silver box, mistaken at first for snuff, and learned that it contained pollen, I began to see a complete picture. Consider the box alongside the reiteration of the service pattern: Miss Chalmers places a tray; Madame pours. On this most recent occasion, Locard himself poured tea before Madame entered— a departure from routine. Madame, upon entering, removed a slim notebook from beside the tray and withdrew briefly. Coffee was then brought for her by Susan; she poured it herself.
Thus, the person who controlled the guests’ cups was consistently Madame Duval. But why would she poison her friends? The answer lies not in malice but in compulsion. Susan’s testimony is of the highest value here. She reported that Madame’s behaviour has altered of late; she burns pages from her poetry book; she tends personally to the newly gifted plants; she seems nervous or sorrowful. A woman at ease does not burn her own writings and record lists under the guise of poetry.
The burnt paper itself, rescued by Susan from the grate, provides the clearest evidence of design. It read VB. S. MF. and HC, each followed by Newmarket, and several words. Initials corresponding neatly to Van Buren, Stevens, Mayfield, Holcroft. An organised list, and a notation of each lady’s connection to Newmarket. Why compile such a list unless Newmarket were the axis upon which events turned?
Now consider the gathering of the 3rd of October. Madame Duval asks her guests, quite specifically, “Has anyone ever spent time in Newmarket?” Twenty or thirty minutes later, Lady Stevens springs up, crying of whispers. She looks beneath the table, to her left and right, hears sounds none else perceive. The other ladies remain calm. At a later gathering, Mrs. Mayfield, who, according to Lady Stevens, spent a short time in Newmarket and had few friends there, perceives figures in empty corners, and cries “I can see her!” and then “He’s right there!”
These visions are not a product of chance. They occur in proximity to discussion of Newmarket, and in those whose history includes it. Here the design becomes apparent. If Halcombe feared that Mayfield’s jest at the birthday dinner signified recognition of his former life as a horse thief in Newmarket, then he would need to determine whether that suspicion extended further— to Mrs. Mayfield, to Lady Stevens, perhaps by extension to their husbands, men of influence and governmental connection. He could not inquire directly; that would betray anxiety. But he could contrive a situation in which those with prior acquaintance to Newmarket might, under the influence of a mild intoxicant, reveal recognition involuntarily. Perhaps by exclamation, by agitation, or by the naming of a face from the past. To effect this, he would require both an intoxicant and access to his chosen subjects.
The intoxicant he supplied in the form of thorn-apple plants, which he delivered as gifts to Madame Duval’s garden. Susan identifies them as his, and notes that he is a man who traffics in “soaps, tonics, colourful inks”. In other words, one accustomed to the preparation and distribution of substances. According to Susan, he arrives unexpectedly at a gathering, speaks privately with Madame in the Orangerie, and eventually promises to “send more later.” She appears displeased, then hands him a note when he departs. What passed between them is not recorded, but its nature may be inferred.
Halcombe, privy to Duval’s indiscretion regarding a secret governmental apparatus, holds leverage. If he were to reveal that Duval had spoken of such matters outside official channels, the consequences for Duval would be severe. Madame Duval, whose fortune supports the household and whose social standing depends upon it, would be acutely aware of this.
Thus blackmail is not merely possible; it is probable. Under such coercion, Madame Duval administered minute quantities of thorn-apple pollen to select cups during her gatherings. Conversation is steered toward Newmarket. A list is kept, tracking which ladies have lived there, how long, and with what degree of intimacy. Observations are made: who reacts, who remains calm, who appears to recognise something, or someone, in the haze of induced hallucination.
The reactions themselves are instructive. Lady Stevens hears whispers; Mrs. Mayfield sees a man and a woman. In delirium, the mind may project buried memories into the present. If either woman had recognised Halcombe from his former life, the drugged state might have brought that recognition to the surface, perhaps even in speech. That none explicitly named him would have reassured Halcombe, yet the violence of Mrs. Mayfield’s distress suggests that the experiment was becoming dangerously conspicuous.
The final confirmation lies in Madame Duval’s reaction to Locard’s casual mention of “Mrs. Mayfield.” At the sound of that name, she drops her china, drains of colour, and flees the room. It is not the concern of a hostess for a guest’s health. It is the panic of a woman entangled in a scheme that may soon unravel.
You add, in your final note, that Duval himself is attempting to ascertain the ladies’, and their husbands’, knowledge of Newmarket and, by extension, Halcombe’s past. I do not wholly absolve Duval of curiosity in this matter, yet the evidence of blackmail and Madame’s furtive behaviour persuades me that the impetus originated with Halcombe, and that Duval’s own role was secondary. In any case, the central engine remains Halcombe’s fear.
A man who has reinvented himself cannot endure the suggestion that his former identity lingers in the minds of others. The spectre of the “horse thief back in Newmarket” would haunt him more effectively than any apparition conjured by thorn-apple. And so he sought to conjure apparitions in others— to watch their faces, to measure their terror, to discern whether the past still lived in their memory. It is an ingenious design, though morally contemptible. The effects of thorn-apple may be unpredictable and severe. That no permanent harm has occurred is due less to restraint than to fortune.
I shall communicate discreetly with Mycroft regarding the governmental aspect of this case. As for Halcombe, he must be confronted with care. A man driven by fear of exposure may escalate from experiment to elimination if cornered too abruptly. I have sent word to Scotland Yard, informing them of his party in this and suggesting his arrest, as well as requesting temporary protections for Madame Duval in the interim.
Pray assure Mrs. Hudson that her niece’s instinct was sound, and that her unease has prevented what might have grown into a far darker affair.
I shall return to Baker Street within the fortnight, and we shall speak further of this curious flower’s effects.
Until then, I remain,
Your faithful friend,
