The British Service would not be forgiving. They could not allow a French spy who knew so much to escape. It would not matter to them that she had never stolen secrets. That she had long since shaken free of her French masters. She’d read thousands of documents as she ciphered and deciphered. The British Service couldn’t afford to let her live.

She let her breath out unevenly, accepting this truth. One must know when it is time to run. When she was a child, her parents had died because they stayed one day too long in Paris, playing a role that was too profitable to abandon.

She lowered the fluttering letter to the blotter to cover the ring. Rested her hands on the desk so they wouldn’t shake. She would not alarm the Fluffy Aunts. Would not bring them to her desk, worried and curious, full of sharp, shrewd attention.

It had been a long, fine game, being Camille Leyland. She’d played it so thoroughly she had almost forgotten it was a lie.

Aunt Lily stood at the table in the corner and leafed through a folio book, exchanging opinions through the open door with Aunt Violet . . . something about the Hermetics and Rosenkreuz. They’d slipped into speaking German.

At any moment either of them could look in her direction and know something was terribly wrong.

Become smooth as an egg. Placid as tea in a cup. Show nothing.

She bent over the desk as if she were reading the letter. Nothing in the poise of her body betrayed fear. Nothing, nothing showed on her face.

I have not forgotten what it is to be a Caché. At the school in Paris—the Coach House, it was called—she’d learned to recite the English kings, to play spillikins and Fox and Geese, to make small bombs, to dance the Scotch Reel, to kill with her hands. She’d had a different name then. Memories of that time spun and tumbled in her head like a pack of cards, tossed in the air, falling.

When she looked up, the world was changed. The books beside her desk, the mail in its prim stacks, the big lamp, the copybooks and quills, the sharpened pencils in the Etruscan cup felt strange, distant, trivial. The woman she was becoming, second by second, no longer belonged in this quiet village, in this small house where two harmless old women argued about Finnish vowel sounds.

The Fluffy Aunts knew the Mandarin Code as well as she did. The man who sent this disgusting letter must be well aware of that. If he couldn’t get the code from her, he would come to acquire it from them. Her first task, before all others, was to lead his attention away from this cottage. Away from the aunts.

She slipped the letter opener into her sleeve, where it stopped being harmless and turned into a dagger again. She put her palms flat on the desk and made herself think.

From the next room, Aunt Violet called, “So vexing. He agrees with Johnson.”

“Then they are both wrong.” Aunt Lily snapped the volume she was studying closed. Emphatically, she pushed her glasses back up the bridge of her nose.

“Huncher is very unhelpful. I’ll try Middleton.”

“I’d accept Middleton,” Aunt Lily stepped briskly from the room, “cum grano salis.

. . . with a grain of salt. She would miss them so much.

She folded the letter, feeling the texture of it acutely, seeing every nuance and shade of the wood grain of her desk. The pearl ring was light in her hand when she picked it up.

For ten years, she’d lived in this safe, pretty cottage in the place that belonged to Camille Besançon. At night, in her room up under the slope of the roof, in the narrow bed beside the window, she’d looked out over the fields toward the mill pond and imagined the child who’d died. That child, her parents, and the young brother had been murdered so a Caché could be placed in the Leyland household. So many murders committed so a French spy could live in the cottage in Brodemere with the Latin and tea cakes, German, algebra, Hebrew and Arabic, the intricacies of code, the calculus, Spanish, Polish, chess, good wine . . . “There is nothing worse than inferior wine,” Aunt Violet always said. “One might as well drink ditchwater.”

I couldn’t have saved that child. I was a child myself, and helpless.

But in the silence of the night, all those years, she’d felt guilty.

Could Camille Besançon have somehow escaped the slaughter? Could the little girl who’d worn this ring possibly be alive?

“Whyever am I holding this Von Herder book?” Aunt Violet’s voice receded toward the parlor. “What was I looking for?”

“Middleton. It should be on the shelf behind you, next to the Asiatic Register. To the right. The other right, dear.”

They’d given her so much. She’d been able to give them so little.

Now she could protect them. She could make certain this blackmailer never, ever came near them. If Camille Besançon had somehow survived, she could give the Fluffy Aunts their niece. Their only blood relative. It would be a small repayment for the lies she’d told.

I’ll never see them again. I can’t even say goodbye.

She slipped the ring into her pocket. It was time to go. She turned in her chair and dropped the blackmail letter on the fire. It blackened and became ashes. No one would be surprised to see her burning it. Codemakers burn every scrap of paper they’re not using.

The man who’d written that sly, lying letter could have bribed some villager or one of the servants to report to him. Even now, someone might be standing in the wood spying on them with field glasses. From this moment on, she’d assume someone was watching.

She’d always known that one day, without warning, it would be time to walk away. But she wasn’t ready. She would never be ready.

She’d made her preparations. Two miles past the parish pump, under a great flat stone at the end of an old stone wall, money, warm clothing, and sturdy walking shoes waited, wrapped in oilcloth. She’d help herself to the muff pistol and kit from the drawer in the hall when she went by. Then she’d stroll down the front walk carrying nothing but her reticule, as if she went on some ordinary stroll to the village. She’d stand up and walk away. It was as simple and as hard as that.

In a minute of two she’d get up and do it. When she was quite certain she wasn’t going to cry.

It didn’t matter how determined and clever you were. When the sword of Damocles falls, there you sit, stupid as a chicken, with your skull cleaved neatly in half.

Two

Many a man has woven his own noose from parchment. Put nothing in writing.

A BALDONI SAYING

Pax stood at the window of the Dancing Dog, holding a mug of ale, looking out at Braddy Square. He’d come back to London, to duty undone and promises broken. To men he’d betrayed. Back to where it began. Back to Meeks Street. There were no decisions to make. No work left undone. He was just putting off the inevitable. Strange to discover this late in the game that he was a coward.

Stop thinking. He’d slogged the leagues across France, crossed the Channel, and made the long ride from Dover to London by not letting himself think.

He set his mug lightly to one of the windowpanes and didn’t pretend an interest in drinking ale. Nobody in the tavern bothered him. He found himself watching a woman who stood in the open space of the square. At this distance she was just a brown cloak, making a line of dark sienna against the light behind. He couldn’t see her face under the hood. Something in the sweep of cloak from shoulder to ground when she moved said she was young. She’d brought bread to scatter for the birds. A couple dozen pigeons and sparrows had formed an attentive circle.

He hadn’t slept for a long time. Hadn’t tried to. He’d ridden . . . how many horses had he ridden to exhaustion? He’d pushed on through the night, not because what he had to do was important but because he’d rather spend the hours riding than lying down, staring at the ceiling in some French inn. He was almost sure he hadn’t slept since he left Paris.

This last quarter mile, within sight of Meeks Street, was the hardest. He couldn’t make himself go on. He’d washed up at the Dancing Dog, dropped his valise, and stuck.

The woman in her dark cloak had a quality of waiting, as if she were meeting somebody. Maybe that was what caught his eye. She stayed motionless while everyone else passed through the square on business that took them elsewhere.

The wide front window of the Dancing Dog was made of old, thick, wavery panes of glass that distorted the world. A man in a blue coat passed the tavern, west to east, carrying a parcel. His image thinned and stretched from pane to pane. It was like watching him through water.

They knew Thomas Paxton at the Dog. A decade ago, when he’d been doorkeeper and messenger boy at Number Seven, he’d raced in and out of here every day, fetching meat pasties and beer to the agents, rattling through at a run, returning empty jugs to the counter in back.

Ten years ago he’d kept an appointment with a traitor in that dim and shadowy back corner to the right. He’d handed over a sheaf of secrets and become a traitor himself. A milestone in his life.

He snuffed out that thought the way he’d pinch off flame to save the candle for another day.

The battered valise at his feet held two changes of clothing, money, and a spare knife. His gun was packed on top, loaded. Carruthers had handed it back when he rode out of Paris, probably hoping he’d use it to suicide. That might be the simplest solution for everybody.