Then again, the idea that there might not be zero people around—that there was something horrible infesting Canaan House, something that had killed Abigail and Magnus for a perceived slight—well, Gideon did not stand there as easily as she might have yesterday. The First House was no longer a beautiful and empty shell, buffeted by the erosion of time. Now it seemed more like the blocked-up labyrinths beneath the Ninth House, kept sealed in case something became restless. When she was young she used to have nightmares about being on the wrong side of the door of the Locked Tomb. Especially after what Harrow had done.

“Look,” said Harrowhark.

No murder, sorrow, or fear could ever touch Harrow Nonagesimus. Her tired eyes were alight. A lot of her paint had peeled away or been sweated off down in the facility, and the whole left side of her jaw was just grey-tinted skin. A hint of her humanity peeked through. She had such a peculiarly pointed little face, high browed and tippy everywhere, and a slanted and vicious mouth. She said irascibly, “At the key, moron, not at me.”

The moron looked at the key, but did give her the middle finger. Harrow was holding the thing upside down for inspection. At the butt end, where the teeth terminated, a tiny carving had been made in the metal. It was a collection of dots joined together with a line and two half circles.

“It’s the sign on my door,” said Gideon.

“You mean—X-203?”

“Yeah, I mean that, if you’re talking in moonspeak,” said Gideon. “It’s definitely the symbol on my door.”

Harrow nearly trembled with eagerness. It took them a while to sneak down the curling route from the atrium to the corridor to the foyer leading to the pit; she was paranoid, and her paranoia had infected Gideon. They kept waiting before turning corners and then stopping to hear if they were being followed. By the time they reached the airless little vestibule, and had slipped the tapestry aside from the door frame and ducked through, Gideon’s stomach wanted breakfast.

Nonetheless, her palms were slick with anticipation as they stood in front of the enormous black door. The animal skulls were as eerie and unwelcoming as they had been the first time; the writhing fat figure curled around each column as creepy and as cold. Harrowhark set her hands on the black stone crossbar of the door almost reverently, and pressed her ear to the rock as though she could hear what was going on inside. She stroked her thumbpad over the deep-set keyhole and pulled her hood over her head.

“Unlock it,” she said.

“Don’t you want the honours?”

“It’s your key ring,” said Harrow unexpectedly, and: “We will do this by the book. If Teacher’s correct, there is something around here that is fairly hot on etiquette, and etiquette is cheap. The key ring is yours … I have to admit it. So you must admit us.” She held out the key to Gideon. “Put it in the hole, Griddle.”

“That’s what she said,” said Gideon, and she took the ring from Harrow’s gloved fingers. She did not put her own hood up, but she slipped her glasses back on to her nose: now that she’d adjusted she really only needed them for the midday light, but they’d become something of a comfort. She drummed her fingers on the bevelled frame of lightless stone, and then she slid the red Response key into the lock.

It fit. The lock clicked open as easily as if it had been kept oiled for the last ten thousand years. Without the slightest creak or groan of hinge, the door swung inward at a push. Gideon slipped her rapier from her belt and her knuckle-knives onto her left hand, and she walked into the darkness.

It was dark. She did not dare go farther into the quiet and shadowy stillness, thrown into deeper quiet by her necromancer slipping in behind and pushing the massive door shut. They stood in the room and smelled the age of it: the dust, the chemicals hanging in the air. You could almost smell the darkness.

Harrow’s voice, almost a whisper: “A light, Nav.”

“What?”

“You did bring a torch.”

“This is a service I was unaware I was meant to provide,” said Gideon.

There followed soft cursing. She felt Harrow turn back toward the door, measure its width with her hands, grope blindly along the doorframe in order to find a lantern: she found something, and from the wall there came a loud click. Electric lights blared to life overhead, throwing the dark and lonely room into knife-sharp relief.

Gideon didn’t know what she’d expected. She stood, rooted to the ground, and so did Harrow; and for long moments they just got their fill of looking.

It was a study, left crystallised by someone who had one day stood up and never come back to the place where they must have worked for years. It was a long, square, spacious apartment, windowless, but beautifully lit. A long rail of electric lamps threw spotlights on important points in the room’s geography. One end of the room was occupied by a laboratory: stained, scoured-laminate benches, and shelves and shelves of notes in leather-bound books or ring binders. The big metal sink and the scrubbing-up brush looked strange against the walls, which were inlaid with bones. A pot was still full of fat chalk sticks to draw diagrams, and the flasks of preserved blood were still full and very red. Tacked up over one bench were thick sheaves of flimsy, dark with graphs and models: one of the flimsies was a rough drawing of a familiar chimera, many armed, armour ribbed, squat skulled. There were jewelled tools. There were epoxy spatulas that had been melted in some experiment. There was a blown-up picture on the wall—a lithograph, or a polymer photograph—of a group of people clustered around a table. Their faces had all been scribbled out with a thick black marker pen.

Harrowhark had already drifted to the laboratory. She hadn’t drawn breath yet. She was going to have to, Gideon thought distantly, or she’d be out on the floor. The room had been split into three main parts—there was the laboratory, and then a broad space where the furniture had been moved out of the way for an empty stone floor. The wall had a sword rack, and the sword rack still held two lonely rapiers, gleaming as though they’d been filed and whetted an hour before. A training floor. Leant up against the wall was a hideous collection of oblong metal shapes and stocks. It took Gideon a long time to realise that she was looking at something goddamn ancient: it was a blowback carbine gun. She’d only ever seen pictures.

The third part of the room was a raised platform with polished wooden stairs. The wood here was not so degraded as in the rest of Canaan House—this lightless, shut-off room must have preserved it, or otherwise somehow been stopped in time. The hairs on the back of Gideon’s neck had risen when the lights came on, and they hadn’t gone back down, as if her intrusion might well tempt time back to claim its grave goods. She found herself climbing the stairs and staring at a sweetly banal and domestic sight: a bookcase, a low table, a squashy armchair, and two beds. On the table was a teapot and two cups that lay abandoned forever.

The two beds were close to each other—if you lay in one, you could stretch out and touch whoever was sleeping in the other, provided you had a long arm—separated only by a nightstand. Much like the grotesque cradle tacked to the end of the enormous four-poster back in Harrow’s bedroom, the two people here would have been in proximity to wake if the other one sneezed. On the nightstand was another lamp, and debris that people had never cleared up. A very old watch. An empty glass. A filament-fine silver bracelet with no clasp. A shallow, greasy glass dish full of grey stuff like ashes. Gideon could tell they weren’t cremains, and when she touched them a strong scent clung to her fingers. The pillows had been smoothed out on the carved wooden cots, and the beds had been made. Someone had left a pair of extremely worn slippers beneath one, a crumpled piece of flimsy next to the nightstand. Gideon picked up the latter.