After nearly giving everything away she spent two days almost entirely cloistered, working with her rapier until the sweat had smeared her face paint to a leering, staved-in mask. She stacked a rusting stool on top of the sagging ebon dresser and did chin-ups into the iron wedge that ran across the rafters. She did press-ups in front of the windows until Dominicus limned her with bloody light, completing its sprint around the watery planet.

Both nights she went to bed sore and furious with loneliness. Crux always had said that she was at her most unbearable after confinement. She fell into a deep, black sleep and woke up only once, the second night, when—in the very early morning when the night outside seemed more like the lightless Ninth—Harrowhark Nonagesimus shut the door behind herself, very nearly silently. She kept her eyes mostly closed as the Reverend Daughter paused before the makeshift bed, and as she watched the robed black figure drifted over to the bedroom. Then there was no more noise; and Harrow was gone again, in the morning, when Gideon awoke. She didn’t even leave rude notes.

It was in this abandoned state that the cavalier of the Ninth House ate two breakfasts, starved of both protein and attention, dark glasses slipping on her nose as she drank another bowl of soup. She would have killed to see a couple of haggard nuns tottering around the place, and was therefore 100 percent vulnerable when she looked up to see a Third House twin stride into the room like a lion. It was the lovely one; she had the sleeves of her gauzy robe haphazardly rolled up to each golden shoulder and her hair tied back in a tawny cloud, and she looked at Gideon with an expression like an artillery shell midflight.

“The Ninth!” she said.

She sauntered over. Gideon had risen to stand, remembering the pale eyes of her pissed-off twin, but instead found a beringed hand proffered in her direction: “Lady Coronabeth Tridentarius,” she was told, “Princess of Ida, heir of the Third House.”

Gideon did not know what to do with the hand, which was offered to her fingers out, palm upward. She touched her fingers to it in the hope that she could grip it briefly and get out that way, but Coronabeth Tridentarius, Princess of Ida, took her hand and roguishly kissed the backs of Gideon’s knuckles. Her smile was sparklingly pleased with her own gall; her eyes were a deep, liquid violet, and she spoke with the casual effrontery of someone who expected her every command of jump! to be followed by a rave.

“I’ve organised sparring matches for the cavaliers of all the Houses,” she said. “It’s my hope that even the Ninth will accept my invitation. Will it?”

If Gideon had not been so lonely; if Gideon had not been so used to having a fighting partner, even one more used these days to battling rheumatism; if Coronabeth Tridentarius had not been so astonishingly hot. All these ifs she contemplated wearily, led by the Third House necromancer down the poky, confined little staircase immediately familiar to her as the one she’d explored before; down to the dark, tiled vestibule with the flickering lights, and through to the room with the foul-smelling chemical pit.

This room was now alive with activity. There were three skeletons down in the pit with hairy mops and buckets, cleaning the slime out of it; a fourth was wiping down the streaked glass double doors through to the mirror room beyond. The fug of rot was overlaid with the equally pervasive fug of surfactants and wood polish. Old age still had the place in a chokehold, but in the hot light of the early morning, two figures danced around each other on the outspread flagstone dais of the mirror room. The urgent metal scrape of sword on sword filled the space up to the rafters.

A skeleton in the corner wound a long pole into a network of cobwebs, displacing showers of dust; a couple of others sat about, watching the fight. The cavalier of the Third she recognised even without his smug little jacket, which he had hung over a peg as he struck a fatigued attitude to clean his sword. She could not mistake the cavalier of the Second in her intense Cohort officer whites, contrasted with a jacket of blazing red. She was watching the two in the centre: facing each other on the flagstones, swords and long knives throwing up bevelled yellow reflections on the walls, were Magnus and the abominable girl teen, stripped down to their shirtsleeves. Everyone looked up as the Princess of Ida glowed into sight, because you couldn’t do anything else.

“Sir Magnus, behold my coup!” she said, and she gestured to Gideon.

This did not produce a susurrus of respectful murmurs, as she had obviously hoped. The dress-uniform cavalier stood to attention, but her gaze was blank and cool. The Fourth girl dropped form and rocked backward on her heels, whistling noisily in fascinated horror. The cavalier of the Third raised his eyebrows and took on an expression of dismay, as though his necromancer had just presented them with a leper. Only Magnus gave her a genial, if slightly bewildered, smile.

“Princess Corona, trust you to nab Gideon the Ninth!” he said, and to his dreadful teen: “See, now you can have a duel with someone else, and not bore everyone by how soundly Jeannemary the Fourth can thrash me.”

(“Nooooo, Magnus, don’t mention me,” hissed that dreadful teen.)

“I’d be ashamed to admit to that,” said the Third cavalier significantly.

The unfortunate Jeannemary the Fourth was going red in the face. She drew herself up to say something obviously unwise, but her sparring partner clapped her on the back with an unsinkable smile.

“Ashamed, Prince Naberius? To lose to a Chatur?” he said heartily. “Goodness me, no. Cavalier family since the time of the Resurrection. Should feel ashamed if she lost to me. I’ve known her since she was a child—she knows I’m absolutely no good. You should have seen her when she was five—”

(“Magnus, do not talk about me being five.”)

“Now, let me tell you this story—”

(“Magnus, do not tell anyone this story.”)

“Challenged me to a duel during a reception, said I’d insulted her—think it was a matter of propping her up with cushions, and to be honest, she would’ve had me if she hadn’t been using a bread knife as her offhand—”

Disgusted beyond all tolerance, the much-tried Jeannemary let out a primal yell and escaped to the benches on the other side of the room, far away from them. Now that she wasn’t looking, Magnus gave Naberius a look of frank reproof. The Third’s cavalier coloured and looked away.

“I want to see a match,” said Princess Corona. “Come—Gideon the Ninth, right?—why don’t you try Sir Magnus instead? Don’t believe him when he says he’s rubbish. The Fifth House is meant to turn out very fine cavaliers.”

Magnus inclined his head.

“Of course I’m willing, and the princess is gracious,” he said, “but I didn’t get to be cavalier primary due to being the best with a rapier. I’m cavalier primary only because my adept is also my wife. I suppose you could say that I—ha, ha—cavalier primarried!”

From the other side of the room, Jeannemary let out a long noise like a death rattle. Princess Corona laughed outright; Magnus looked extremely pleased with himself. The faces of the other two were patiently blank. Gideon made a mental note to write down the joke so that she could use it herself later.

Corona inclined her bright head in toward Gideon. She smelled nice, like how Gideon imagined soap was meant to smell.