I am not a good man. I know this. I have always known this. From the moment I understood what I was doing—what I was willing to do—I knew. And still I did it. Still I would do it again, if the choice came back to me, because choice is a luxury that men like me are rarely given.

My name is Paddy O'Connor. I was born in County Mayo, Ireland, in a cabin that leaned to the left and smelled of peat smoke and wet earth, and I grew up hungry—not the kind of hungry where your stomach grumbles, but the kind of hungry where your bones ache and your vision goes dark and your mother looks at your siblings and her eyes fill with a terror so deep she cannot speak it.

The famine took my father first. He died in a workhouse in Liverpool, a city I never visited but know by reputation as a place of soot and sorrow. Then it took my younger sister, Bridget, who was seven and beautiful and had eyes like the sky after rain. She died in our cabin, wrapped in a blanket that was more hole than wool, whispering a name that I could not hear over the screaming of the other children.

And then it took everything else, until there was nothing left to take, and I was twenty-three years old, standing on a dock in New York Harbor, looking at a city that was so bright and so loud and so full of people who did not care that I existed, and I knew that I was exactly where I had always been: alone.

--

I made my living the way men like me make their living: by doing things that other men would not do. I was a runner—a term that sounds noble, like a messenger in a war—when what I really was was a thief, a liar, and occasionally something worse than both. I lived in a tenement on the Lower East Side that smelled of cabbage and other people's cooking and the constant damp that never goes away no matter how many times you hang your sheets outside.

I had no skills. I could not read, though I could pretend to. I could write my name and nothing else. I was strong, and I was fast, and I was willing to do things that honest men would not, and that was enough. New York does not need honest men. It needs men who will carry boxes at three in the morning, who will stand in line for twelve hours to get a job that pays twelve cents an hour, who will look the other way when something unpleasant needs to happen.

That was me. Paddy O'Connor. The man who looks the other way.

--

I first saw the serpent in the autumn of 1889, when I was wandering through the outskirts of Appalachia, following a lead on something that turned out to be nothing. I had heard about a man in the mountains who claimed to have seen a snake the size of a carriage horse, and I thought: maybe this man will pay me to find it, or maybe I can sell the story to a newspaper, or maybe—just maybe—something in the mountains will give me money.

The snake was in a cave beneath an enormous cypress tree, the kind of tree that looks like it grew out of the earth already old and already tired of living. The cave was hidden behind a curtain of Spanish moss, and I found it by accident—I was running from a farmer's dog, and I ducked into what I thought was a hollow, and I found myself in a tunnel that led down into warm dark air that smelled of mineral water and something else: something alive and ancient and very, very patient.

I went down.

The cavern opened into a space no larger than a barn, and in the center of it, coiled upon a raised platform of warm stone, was the serpent.

It was an eastern diamondback—the largest venomous snake in the eastern United States—but it was unlike any diamondback I had ever seen. It was at least fifteen feet long, its body thick as a barrel, its scales the color of wet earth and dried blood and the inside of a bruise. Its rattle—if you could call it that—was not the dry, clicking rattle of an ordinary diamondback. It was softer, deeper, a sound like something vibrating in the stone itself, a frequency that you felt in your bones more than you heard with your ears.

And beside it—crouched on the ground like a child hiding from a storm—was a girl.

She was young, maybe twelve, with skin the color of dark honey and hair that was black and thick and braided in the style of the plains Indians, though she was not Indian. Her eyes were wide and golden-brown, and they were fixed on the serpent with an expression that was neither fear nor love but something that lived in the space between them, something that I would not have been able to name if someone had held a gun to my head and told me to name it.

The serpent lifted its head. It looked at me.

And I felt—this is not exaggeration—I felt it look at me. Not with its eyes. With something deeper than eyes. Something that reached through the dark air and touched the place inside me where I kept the memory of Bridget and the famine and the empty cabin and said: I know you. I have always known you.

The girl spoke. Not to me. To the serpent. In a language I did not know—the soft, flowing language of the Plains Cree, I would learn later—and the serpent made that deep vibrating sound, and the girl stood up and looked at me and said, in English that was careful and halting and precise: "You should not be here."

--

Her name was Elk-Eye. She was the last of her band—her people, the Cree who had migrated south generations before and settled in the foothills of the Appalachians and lived in a way that was neither fully Indian nor fully white, but something in between, something that both sides mistrusted. She was the last because cholera had taken the others, one by one, over the course of a single summer, and she had survived because the serpent had carried her through the flood that had washed away the camp and deposited her three miles downstream, where a white family had found her and raised her for six months before she had run away to find the cave.

"They're all dead," she said, sitting on the stone floor beside the serpent, her legs drawn up to her chest, her golden-brown eyes fixed on me with an intensity that made my hands shake. "All of them. And the serpent—he is old. Older than the mountains. Older than the creek. Older than my people. He will die soon, and when he does, there will be nothing left of the old ways. Nothing."

The serpent vibrated. It was a low sound, like a cello string being bowed by a hand that knew exactly which note to strike.

"He says," Elk-Eye translated, without looking away from me, "that you are hungry."

I was. I had not eaten in two days. I nodded.

She stood up. "Come," she said. "I will give you food."

--

She was Cree, not in the way that the government defines Cree—on a paper with a number and a stamp and a signature—but in the way that the old Cree were Cree: in the way she moved, in the way she looked at the serpent, in the way she carried herself with a dignity that made me feel smaller than I had ever felt in my life.

She gave me cornbread and dried venison and a cup of tea that tasted like pine needles and something sweet that I could not identify. I ate with my hands, because I had no utensils, and she watched me eat with an expression that was neither judgment nor pity but simply attention—the kind of attention that you give to a thing that is interesting and unfamiliar and worth understanding.

"The serpent has a name," she said, after I had finished eating. "In our language. It means... he who watches. He who has always watched."

She looked at the serpent. "He has watched our people for longer than anyone can remember. He was here before my great-great-grandmother. He was here before the white men came with their ships and their Bibles and their contracts. He was here before the Europeans came with their maps and their greed and their need to name everything so they could own it."

She turned back to me. "He is the last of the old people. And when he dies, there will be no one left to remember."

--

I stayed for three days. I told myself I was staying because I was hungry and I needed a bed and the cave was warmer than the mountain air. But the truth was more complicated than that. The truth was that Elk-Eye looked at me the way the serpent looked at her—without fear, without love, with the deep, patient attention of a creature that sees exactly what you are and does not judge you for it.

And the truth was that on the third night, when I was sleeping on a bed of pine needles in a corner of the cave and the serpent was coiled in the center of the cavern and Elk-Eye was sitting beside him, stroking his scales with her fingers, I dreamed of Bridget. I dreamed of her in the cabin, in the blanket that was more hole than wool, whispering my name. And I woke up with tears on my face, and Elk-Eye was looking at me, and she did not say anything. She simply reached out and touched my hand, and her hand was warm, and I stopped crying.

--

On the fourth morning, I left.

I had to leave. There was a man in Charleston—Henry Vanderbilt, a steel magnate, a man who had more money than God and less sense than a dog—who had heard rumors. Rumors of a snake in the Appalachians. Rumors of a snake that carried something in its body that could cure any disease. Rumors of an Indian girl who lived with the snake and spoke to it.

Vanderbilt was not a cruel man. He was a desperate man. His daughter—twenty-two, beautiful, dying of consumption—had been given up for dead by three doctors, and he was looking for anything. Anything at all. And when he heard about the snake, he hired a man named Dr. Moreau, a French physician with a reputation for radical treatments and an absolute absence of moral scruple, and Dr. Moreau hired me.

Not hired. Begged. He found me in a bar in Asheville, and he knelt—knelt, I tell you, a man worth thirty million dollars, kneeling in the dirt in front of a dirty Irish drunk—and he said: "Mr. O'Connor, I will pay you ten thousand dollars to find that snake and bring me to it."

Ten thousand dollars. I had never seen ten thousand dollars. I had never seen more than twenty dollars at a time.

I said yes.

--

I am not proud of this. I have never been proud of it. Every night before I sleep, I see Elk-Eye's hand on my hand, warm and steady, and I see the serpent's eye, golden and horizontal, looking at me with that ancient, patient knowledge that said: I know you. I have always known you.

And I did it anyway.

I organized the expedition. I found four men—farmers from the valley, men who were tired of farming and tired of being poor and willing to follow anyone who promised them money. I led them through the mountains, through rain and mud and darkness, to the cave beneath the great cypress tree.

Elk-Eye saw us coming. She stood at the entrance of the cave and raised her arms and shouted in Cree, a language that sounded like wind through grass and water over stone, and the serpent rose to his full height and his rattle—his deep, vibrating rattle—filled the cavern with a sound that I felt in my teeth and my bones and the place inside me where I kept Bridget.

"Don't," Elk-Eye said to me. Her voice was calm. Calmer than I had ever heard it. "Paddy, please don't."

I looked at her. I looked at the serpent. And I looked away.

That is the thing I carry. Not the money. Not the shame. The looking away.

--

They killed him with dynamite.

Dr. Moreau did not want to kill him, technically. He wanted to capture him alive. But the snake would not come out of the cave, and the men were impatient, and the sun was setting, and Dr. Moreau had a train to catch in Asheville, and so he gave the order: blow the entrance open.

The explosion threw me backward into the dirt. I heard Elk-Eye scream—a sound I have never heard before and pray to God I never hear again. The cave shook. Dust fell from the ceiling. The serpent's rattle stopped.

When the dust settled, I crawled into the cave.

The serpent was dead. A fragment of dynamite had pierced his body, and the amber fluid—Le Sang du Marais, the Blood of the Swamp, the thing that Vanderbilt's daughter needed, the thing that Elk-Eye's people had guarded for centuries—was pouring from the wound and pooling on the stone floor and glowing faintly, like embers in a dying fire.

Elk-Eye was on her knees beside him, her hands pressed to the wound, her golden-brown eyes closed, her mouth moving in a prayer I could not hear.

I stood in the entrance and watched, and I did nothing.

That is what I carry. Not the money. Not the shame. The not doing anything.

--

Dr. Moreau filled forty-seven vials. He packed them in straw and put them in a wooden crate and strapped the crate to his horse and rode to Asheville and caught his train and rode to Charleston and went to Vanderbilt's house and gave the vials to Vanderbilt's butler and said: "Tell your master this will cure his daughter."

It did not cure her.

The Blood worked—for one day. Vanderbilt's daughter sat up in bed and asked for breakfast and ate half a bowl of oatmeal and smiled at her father and said his name in a voice that had been weak for months and was now strong.

And then she got worse. Faster than before. The Blood had given her strength. But it had not given her life.

On the third day, she was dead.

Vanderbilt killed Dr. Moreau. Not directly—he did not put a gun to his head or pour poison in his cup. He simply sued him. For malpractice. For fraud. For everything. And Moreau, who had no money and no reputation and no friends, lost everything. He moved to Mexico and disappeared into a city that smelled of chili and dust and sin and died there ten years later, forgotten and alone.

Vanderbilt's daughter was buried in a cemetery in Pittsburgh, and her father never spoke her name again, and I hear he died twenty years later, rich and alone and staring at a wall.

Elk-Eye—Elk-Eye went back to the cave.

--

The vials were gone. Dr. Moreau had taken them. The Blood was gone. And the serpent was gone, and Elk-Eye was the last Cree, and the old ways were gone, and I had done all of this.

I went back to the cave one last time, a week later. The entrance was collapsed. I dug for three days with my hands, pulling dirt and rock and broken roots until my fingers bled, and I opened the entrance and crawled inside.

The cavern was empty. The stone platform was cracked. The pool was dry. And on the floor, in the place where the serpent had slept, was a single scale. A single diamondback scale, the color of wet earth and dried blood, lying on the stone like a piece of something that had been real and had been destroyed and had been replaced by nothing.

I picked it up. It was warm.

I put it in my pocket. I still have it. It is the only thing I have left from that day.

--

I returned to New York. I returned to the tenement. I returned to the bar and the dirt and the looking away. I earned the ten thousand dollars and I spent them in three years—on whiskey, on women, on things that did not matter and could not fill the hole inside me where Elk-Eye's hand had been, warm and steady.

But I never stopped seeing her. Every night before I sleep, I see her sitting beside the serpent, stroking his scales with her fingers, looking at me with those golden-brown eyes that saw exactly what I was and did not judge me for it.

And I see the serpent. His golden eye. His deep vibrating rattle. The look that said: I know you. I have always known you.

I am not a good man. I know this. I have always known this.

And I am sorry.

I am so sorry.

--