Read Chapter 5: The Brother's Debt

The gambling den announced itself with a stench of sweat, cheap tallow, and desperation that clung to Marguerite’s cloak like a second skin. She had followed Armand de Saint-Père through the labyrinth of Paris’s midnight streets, past shuttered apothecaries and sleeping beggars, until he ducked beneath a sign bearing a tarnished golden wheel. No servant had questioned her. In this place, shadows were currency, and she spent hers freely.

She pressed herself into an alcove behind a sagging curtain, the dust of decades stinging her nose. The room beyond was low-ceilinged and thick with smoke from clay pipes. Men of quality—their lace cuffs and velvet jackets ill-suited to the grime—hunched over tables of cards and dice, their faces lit by guttering candles that seemed to drain the air of its virtue.

Armand stood at the far end, his back to her, his shoulders rigid beneath an expensive coat worn thin at the elbows. Across from him, draped in a chair like a spider in its web, sat the Marquis de Brissac.

Marguerite had seen the Marquis only once before, at a court reception, where he had seemed a benign, silver-haired gentleman with a fondness for aphorisms. Here, in the yellow candlelight, his smile had teeth. He did not look at the cards. He looked at Armand the way a cat looks at a mouse that has already forgotten the way to its hole.

“The sum, if you please,” Brissac said, his voice a low, pleasant hum. “I confess my arithmetic fails me when it comes to gentlemen’s promises.”

Armand’s hands clenched at his sides. “I told you. By the end of the month.”

“And the end of the month is two days away, is it not? The very day of Her Majesty’s soirée. A charming coincidence, would you not agree?” Brissac raised a goblet of wine, sniffed it, and did not drink. “You attended last year, I recall. How your sister glowed. The Duchesse de Montfort is the envy of every woman at court.”

The mention of the Duchesse made Marguerite’s blood run cold. She leaned closer, heedless of the splintered wood scraping her cheek.

“My sister has nothing to do with this,” Armand said, his voice cracking on the word *sister*.

“And yet her fortune does.” Brissac set down the goblet. The sound was soft, but in the silence that rippled through the room, it seemed to echo. A few heads turned, then returned to their games. The Marquis leaned forward, his voice dropping to a murmur that Marguerite strained to hear. “You owe me forty thousand livres, Armand. I do not deal in patience. I deal in remedies.”

Armand flinched. It was small, nearly imperceptible, but Marguerite saw it. She saw, too, the way his hand drifted toward his pocket, where she knew—she *knew*—the little vial resided.

“You shall have your payment,” Armand said. “With more than gold, if that is what you require.”

Brissac’s smile widened. It did not touch his eyes. “That is precisely what I require. A service. A small, delicate service, suited to a man of your particular… access.”

“Which is?”

“Your sister’s bedchamber. Her private apartments. Her very presence.” Brissac traced a finger along the rim of his goblet. “You are her brother. Her blood. No one would suspect you of wishing her ill.”

The words hung in the smoky air like a physical thing. Marguerite’s heart hammered against her ribs. She wanted to burst through the curtain, to scream, to claw at Brissac’s composed face. But she held herself still, her fingernails biting into her palms.

“I do not wish her ill,” Armand said, his voice barely audible. “I wish her to be well. That is why I came to you, remember? When the physicians could do nothing for her melancholia. When the court whispered that she might not survive the season. I sought a remedy.”

“And I provided one,” Brissac said smoothly. “A gentle tonic to steady the nerves. You paid handsomely for it, at first. Then you found other diversions. The tables. The horses. The ladies of the opera. Your debts grew. You came to me again, and again, and again—not for remedies, but for loans. And now the remedy is no longer for her nerves.”

Armand’s face went pale. “I cannot. She is my sister. Whatever I have done, whatever I owe, I cannot.”

“Cannot?” Brissac rose from his chair with the fluid grace of a predator. He stepped close to Armand, so close that their breath mingled. “You misunderstand, my dear boy. You do not *choose* to pay me. You have already chosen. Every night you sat at my tables, every hand you played, every glass of wine you accepted from my steward—those were choices. The only choice remaining is how you pay.”

Armand’s jaw worked. He looked, for a moment, like the frightened valet’s warning had described: a man who did not need saving. A man who had already damned himself.

“What bearing does her death have on my debt?” Armand asked, and Marguerite’s stomach turned at the coldness creeping into his voice.

“Her death clears the debt entirely,” Brissac said. “And relieves you of your burden. And provides me with a certain… leverage at court. The Duchesse has been spoken of as a possible patroness of the Queen’s charities. A woman of her influence, with her sympathies, could do much damage to certain interests. Interests I represent.”

“You represent the devil,” Armand muttered.

“The devil pays well.” Brissac’s smile returned. He withdrew a small, folded paper from his waistcoat and pressed it into Armand’s hand. “Everything you need is here. A remedy for your sister’s melancholia. A final dose, if you will. She will sleep. She will not wake. The physicians will call it a failure of the heart. No one will question a grieving brother who sought a cure.”

“And the Comtesse de Brionne?” Armand asked, his voice barely a whisper. “She delivered your parcel. She knows.”

Brissac laughed, a dry, papery sound. “The Comtesse is a tool. Tools are discarded when they have served their purpose. She will not be a problem.” He paused. “Do not concern yourself with the Comtesse. Concern yourself with your sister.”

Armand looked at the folded paper in his hand. For a long moment, he did not move. Marguerite’s breath caught. She willed him to refuse, to tear the paper to shreds, to strike the Marquis across his smiling face.

Then Armand’s fingers closed around the paper. He tucked it into his coat. He nodded once, sharply, like a man sealing his own fate.

Brissac watched him go with satisfaction. As Armand passed the curtain behind which Marguerite hid, she caught the expression on his face: a mixture of terror and resignation, the look of a man who has already decided to do the unforgivable.

The door to the den wheezed shut behind him. Marguerite stayed frozen in her alcove, her mind racing. The pieces had fallen into place with awful clarity. Armand’s debts. Brissac’s remedies. The vial in Armand’s pocket. The Comtesse de Brionne’s parcel. It was all connected, a thread leading from the gambling dens of Paris to the gilded halls of Versailles, to the very bedchamber of the Duchesse.

And at the center of it all, a brother who had just agreed to kill his own sister.

Marguerite slipped out of the den into the cold night air, pulling her hood low against the drizzle. She felt the weight of her mother’s locket against her chest, the vial of *l’essence du sommeil* a cold reminder of all that was at stake. She had to warn the Duchesse. She had to tell Dr. Beaumont. She had to—

She stopped mid-step.

A figure emerged from the shadows across the street, leaning against the wall with apparent casualness. He wore a plain cloak, but his posture was too still, too watchful. Marguerite’s hand went to the small knife she kept concealed in her sleeve.

“You reveal yourself poorly,” the figure said. The voice was familiar. Too familiar.

Dr. Beaumont stepped into the lamplight, his face grim. “I have been following you since you left the palace, Marguerite. I hoped you would turn back.” He shook his head, and there was a weariness in his eyes that made her cold. “But I suspect you have heard enough to know that you cannot turn back now.”

She took a step toward him, her heart pounding. “You know. About Armand. About Brissac. About all of it.”

Beaumont said nothing for a long moment. Then, slowly, he nodded.

“I know who killed your mother, Marguerite,” he said, his voice low. “And I know the name of the man who ordered her death. But if I tell you, there is no returning. We will have crossed a line that neither of us can uncross.”

The rain fell harder. Marguerite’s fingers curled around her mother’s locket.

“Tell me,” she said.