At last I ventured the word I had tried to avoid. ‘Equine,’ I suggested.

‘Ah!’ There was a world of relief in her voice. ‘You’ve seen it too.’

She told me a queer tale. Dearth, it appears, had a love and understanding of horses that was quite unparalleled. His wife too had loved horses and it had once pleased her to see her husband’s astonishing power over the creatures, a power which he exercised always for their good. But his benefactions to the equine race were made at a hideous cost to himself of which he was utterly unaware. Monica’s theory was too fantastic even for me to swallow, and I, as you know, have a good stomach for fantasy. You will have already guessed what it was. Dearth was growing, by a process too gradual and subtle for perception, into the likeness of the horses with whom he had so complete sympathy. This was Mrs. Dearth’s notion of what was happening to her husband. And she pointed out something significant that had escaped my notice. She pointed out that the difference between him and the next man was not altogether, or even mainly, a physical difference. In effect she said: ‘If you scrutinize the features more carefully, you will find them to be far less extraordinary than you now suppose. The poison is not in his features. It is in the psychical atmosphere he carries about with him: something which infects you with the idea of horse and makes you impose that idea on his appearance, magnifying his facial peculiarities.’ Just now I mentioned that in the early days of her marriage Monica had shared this love of horses. Later, of course, she came to detest them only one degree less than she detested her husband. That is saying much. Only a few months before my visit matters had come to a crisis between the two. Without giving any definite reason, she had confessed, under pressure, that he was unspeakably offensive to her; and since then they had met only at meals and always reluctantly. She shuddered to recall that interview, and I shuddered to imagine it. I was no longer surprised that she had begun to entertain doubts of her own sanity.

But this wasn’t the worst. The worst was Dandy, the white horse. I found it difficult to understand why a white horse should alarm her, and I began to suspect that the nervous strain she had undergone was making her inclined to magnify trifles. ‘It’s his favourite horse,’ she said. ‘That’s as much as saying that he dotes on it to a degree that is unhuman. It never does any work. It just roams the fields by day, and at night sleeps in the stable.’ Even this didn’t, to my mind, seem a very terrible indictment. If the man were mad on horses, what more natural than this petting of a particular favourite?—a fine animal, too, as Monica herself admitted. ‘Roams the fields,’ cried my poor cousin urgently. ‘Or did until these last few weeks. Lately it has been kept in its stable, day in, day out, eating its head off and working up energy enough to kill us all.’ This sounded to me like the language of hysteria, but I waited for what was to follow. ‘The day you came, did you notice how pale I looked? I had had a fright. As I was crossing the yard with a pail of separated milk for the calves, that beast broke loose from the stable and sprang at me. Yes, Dandy. He was in a fury. His eyes burned with ferocity. I dodged him by a miracle, dropped the pail, and ran back to the house shrieking for help. When I entered the living-room my husband feigned to be waking out of sleep. He didn’t seem interested in my story, and I’m convinced that he had planned the whole thing.’ It was past my understanding how Dearth could have made his horse spring out of his stable and make a murderous attack upon a particular woman, and I said so. ‘You don’t know him yet,’ retorted Monica. ‘And you don’t know Dandy. Go and look at the beast. Go now, while James is out.’

The farmyard, with its pool of water covered in green slime, its manure and sodden straw, and its smell of pigs, was a place that seldom failed to offend me. But on this occasion I picked my way across the cobblestones thinking of nothing at all but the homicidal horse that I was about to spy upon. I have said before that I’m not a courageous man, and you’ll understand that I stepped warily as I neared the stable. I saw that the lower of the two doors was made fast and with the more confidence unlatched the other.

I peered in. The great horse stood, bolt upright but apparently in a profound sleep. It was indeed a fine creature, with no spot or shadow, as far as I could discern, to mar its glossy whiteness. I stood there staring and brooding for several minutes, wondering if both Monica and I were the victims of some astounding hallucination. I had no fear at all of Dandy, after having seen him; and it didn’t alarm me when, presently, his frame quivered, his eyes opened, and he turned to look at me. But as I looked into his eyes an indefinable fear possessed me. The horse stared dumbly for a moment, and his nostrils dilated. Although I half-expected him to tear his head out of the halter and prance round upon me, I could not move. I stared, and as I stared, the horse’s lips moved back from the teeth in a grin, unmistakably a grin, of malign intelligence. The gesture vividly recalled Dearth to my mind. I had described him as equine, and if proof of the word’s aptness were needed, Dandy had supplied that proof.

‘He’s come back,’ Monica murmured to me, on my return to the house. ‘Ill, I think. He’s gone to lie down. Have you seen Dandy?’

‘Yes. And I hope not to see him again.’

But I was to see him again, twice again. The first time was that same night, from my bedroom window. Both my bedroom and my cousin’s looked out upon that grassy hill of which I spoke. It rose from a few yards until almost level with the second storey of the house and then abruptly curved away. Somewhere about midnight, feeling restless and troubled by my thoughts, I got out of bed and went to the window to take an airing.

I was not the only restless creature that night. Standing not twenty yards away, with the sky for background, was a great horse. The moonlight made its white flank gleam like silver, and lit up the eyes that stared fixedly at my window.