PART ONE

The steamship Chatham cut through the fog like a blade through silk, and Julian Beauregard II stood at the rail and watched the Mississippi dissolve the world behind him. The river was wide and brown and smelled of mud and cotton and something older—something like the memory of rain on a plantation floor. He had not slept since New Orleans. The jazz from the club on Bourbon Street still played in his head, a saxophone note bending downward like a man falling.

He was twenty-eight years old. He had seen men die in the Argonne forest and had written about it in the Times with a pen that ran out of ink at the worst moment. He had searched for Clara for seven hundred and thirty-two days. He was tired.

The island rose from the river ahead—圣伊莎贝尔岛, or St. Isabel, as the captain called it in English, a slim green ribbon of land punctuated by a single tall building with a bell tower. Dr. Whitfield had sent the invitation by a man in a linen suit who spoke with no accent and smiled with too many teeth. "A mystery," the man had said, and the way he said it made Julian think of a card trick.

The dock was wooden and leaned at an angle that suggested it had been leaning for a long time. A woman waited on the dock. She was perhaps thirty, with dark hair pulled back in a knot and a dress the color of weak tea. She did not introduce herself. She took his suitcase and led him up a path lined with magnolia trees whose flowers lay on the ground like discarded gloves.

The bell tower struck six. The sound rolled across the water and did not fade.

PART TWO

The patients lived in a wing of the main building that Julian would later describe as "a cathedral of polite insanity." There were twelve rooms, each one on the second floor of the west wing, each one accessible by a corridor exactly forty-eight feet long. He measured it because he was a man who measured things—war had taught him that numbers were the only honest language.

Room seven was Celeste's. The door was locked from the outside with a brass keyhole. The window on the left side was latched from within. The window on the right side was latched from within. The room contained a bed, a washstand, a mirror, and a single chair. When Julian opened the door and stepped inside, the room was empty.

Not just empty. Julian had been a war correspondent. He had seen empty rooms in bombed-out buildings in Verdun, empty rooms after a family had fled with nothing but the clothes on their backs, empty rooms where a body had been and then was not. This was different. This room was empty the way a word is empty when you pull it out of a sentence and the sentence falls apart.

"Where did she go?" Julian asked.

The woman who answered was sitting in the chair in the corridor, mending a sock. She looked up with eyes that were entirely calm. "She went where the numbers sent her, Mr. Beauregard. Don't you know the arithmetic of this place?"

"What numbers?"

She held up her hand. Twelve fingers between the two of them, if you counted the phantom limbs of memory. "Twelve apostles. Twelve months. Twelve bars in a measure of jazz. You Americans love your twelves."

She went back to her sock.

Julian spent three days on the island. He spoke to the patients—women from New Orleans and Memphis and Mobile, daughters of merchants and doctors and one woman who had been a singer at a club on Peabody Avenue before the voice went. They told him stories that did not quite align: one said Celeste had walked out in the night; another said she had never existed; a third said Celeste was in room nine, and when Julian went to room nine, he found a single magnolia flower on the pillow and the number twelve carved into the headboard in a hand that was not Celeste's.

On the third night, Julian sat in the library and read the island's ledger. It was kept in a leather-bound volume that had once been a church register. The names of the patients were written in a careful hand alongside the names of sins: Pride, Envy, Wrath, Sloth. Seven deadly sins, but twelve women. The extra five were listed as: Doubt, Silence, Longing, Memory, Forgetting.

Twelve sins. Twelve women. Twelve windows in each room, each window divided into six panes, six times twelve equals seventy-two. Seven plus two equals nine.

He stared at the number nine on the page and felt something click in his chest, like a key turning in a lock he did not know existed.

PART THREE

Clara found him on the fourth morning.

She was standing at the edge of the river, watching the fog lift from the water, when a voice behind him said: "You always did stare at rivers when you were trying to think."

He turned. She was wearing a dress he did not recognize and a smile that was almost the Clara he had known before the influenza took her—or rather, before she disappeared, because she was not dead, she had simply stopped being where he could find her.

"Clara," he said, and the word was a stone in his throat.

"Julian." She walked toward him, and the magnolia trees leaned over the path like people watching through a window. "I wondered when you'd come. Whitfield said you would. He said you always came."

"Where have you been? For two years, I've—"

"I've been here. Working. Helping." She gestured toward the building. "This is not what you think it is."

"It's an asylum."

"It's a hospital. For people the world has decided are broken beyond repair." Her voice was calm, but her hands were not. "Whitfield's experiment—he uses something he calls Isabel's Dew, a substance derived from indigenous South American botanicals. It doesn't destroy. It reveals. Patients see themselves clearly for the first time. Some can't bear it. Some—" She paused. "Some find what they were looking for."

"Did you design this?"

"I designed part of it." She looked at the river. "Before I disappeared. Before I became... unfindable."

Julian felt the ground tilt. "Why did you disappear?"

Clara turned to face him. Her eyes were clear—the same clear clearness he had seen in Margaret's eyes in another life, in another story. "Because the world wasn't ready for what I was trying to say. And because I needed you to come here. I needed you to see what happens when a person is given the chance to break and put themselves back together."

She took his hand. Her palm was warm. Her fingers were real.

"I'm not a ghost, Julian. I never was. I was working."

PART FOUR

On the fifth day, Julian made his decision. He would write the story. Not the story Whitfield wanted—the story of a noble experiment, of healing and hope. He would write the truth: that a man had spent two years looking for a woman who was hiding in plain sight, that a doctor was conducting experiments on the wealthy and the inconvenient, that the number twelve was not a code but a confession.

But before he wrote it, he would stay one more night. One more night to help Clara finish the treatment for room nine. One more night to sit with a woman who had lost everything and let her speak until the words ran out.

He stood on the dock at dawn and watched the Chatham's lights appear through the fog. The saxophone from the club on Bourbon Street played again in his head, bending downward, bending upward, bending around the numbers he could no longer unsee.

Twelve. Twelve. Twelve.

The boat pulled closer. The fog thinned. Somewhere behind him in the building, a woman was singing in a voice that had no words and every word.

Julian Beauregard II stepped onto the deck of the steamship and did not look back.