One dwarf in the cells, one in the tender, loving care of Igor, Vimes thought, as he trudged up the stairs to his office. And it’s only going to get worse. Those dwarfs were obeying Ardent, weren’t they? What would they have done if the dwarf had shaken his head?

He landed in his chair so hard that it rolled back a foot.

He’d met deep-down dwarfs before. They’d been weird, but he’d been able to deal with them. The Low King was a deep-downer, and Vimes had got on with him well enough, once you accepted that the fairy-tale dwarf in the Hogfather beard was an astute politician. He was a dwarf with a vision. He dealt with the world. Ha, “he’d seen the light.” But those in the new mine…

He hadn’t seen them, even though they were sitting in a room made brilliant with the light of hundreds of candles. That seemed odd, since the grags themselves were completely shrouded in their pointy black leather. But maybe it was some mystic ceremony, and who’d look for sense there? Maybe you got a more holy dark in the midst of light? The brighter the light the blacker the shadow?

Ardent had spoken in a language that sounded like dwarfish, and out of the dark hoods had come answers and questions, all barked out in the same harsh, brief syllables.

At one point, Vimes was asked to repeat the meat of his statement made up above, which had seemed too far away now. He’d done so, and there’d been a long-drawn-out discussion in what he’d come to think of as Deep Dwarf. And all the time he felt that eyes he could not see were watching him very hard indeed. It didn’t help that his head had been aching like mad and there were shooting pains going up and down his arm.

And that was it. Had they understood him? He didn’t know. Ardent had said that they agreed with considerable reluctance. Had they? He hadn’t a clue, not a clue, to what had really been said. Would Carrot be given access to a crime scene that had not been interfered with in any way? Vimes grunted. Huh. What do you think, boys and girls?

He pinched the bridge of his nose, and then stared at his right hand. Igor had gone on at length about “tiny invithible biting creatureth” and used some vicious ointment that probably killed anything of any size or visibility. It had stung like seven hells for five minutes, but the sting had gone and seemed to have taken the pain with it. Anyway…what mattered was that the Watch was officially on this case.

His eye was caught by the top sheet of paperwork in his in-tray.* He groaned as he picked it up.

…and so on. Vimes read on with his mouth open. All right, the man wasn’t a copper—definitely not—but surely he had a fully functional brain? Oh, good grief, he’d even spotted the monthly discrepancy in the petty-cash box! Would A. E. Pessimal understand if Vimes explained that Nobby’s services over the years more than made up for the casual petty theft, which you accepted as a kind of mild nuisance?

Would that be an economic use of my time? I think not.

As he put the paper back in the tray, he spotted a sheet underneath, in Cheery’s handwriting. He picked it up and read it.

Two dwarfs and one troll had handed in their badges this morning, citing “family reasons.” Damn. That was seven officers lost this week. Bloody Koom Valley, it got everywhere. Oh, it couldn’t be fun, heavens knew, being a troll holding the line against a bunch of your fellow trolls and defending a dwarf like the late Hamcrusher. It probably wasn’t any funner being a dwarf hearing that some troll street gang beat up your brother because of what that idiot had said. Some people would be asking: Whose side are you on? If you’re not with us, you’re against us. Huh. If you not an apple, you’re a banana…

Carrot came in quietly and placed a plate on the desk.

“Angua told me all about it,” he said. “Well done, sir.”

“What do you mean, well done?” said Vimes, looking at his healthy sandwich lunch. “I nearly started a war!”

“Ah, but they didn’t know you were bluffing.”

“I probably wasn’t.” Vimes carefully lifted the top of the bacon, lettuce, and tomato sandwich, and smiled inwardly. Good old Cheery. She knew what a Vimes BLT was all about. It was about having to lift up quite a lot of crispy bacon before you found the miserable skulking vegetables. You might never notice them at all.

“I want you to take Angua down there with you again,” he said. “And…yes, Lance Constable von Humpeding. Our little Sally. Just the job for a vampire who fortuitously has arrived in the nick of time, eh? Let’s see how good she is.”

“Just those two, sir?”

“Er, yes. They both have very good night vision, yes?” Vimes looked down at his sandwich, and mumbled: “We can’t take any artificial light down there.”

“A murder investigation in the dark, sir?”

“I had no choice!” said Vimes hotly. “I know a sticking point when I see one, Captain. No artificial light. Well, if they want to play silly buggers, I’m their boy. You know about mines, and both the ladies have got night vision built in. Well, the vampire has, and Angua can practically see with her nose. So that’s it. Do the best you can. The place is full of those damn glow beetles. They should help.”

“They’ve got vurms?” said Carrot. “Oh. Well, I know some tricks there, sir.”

“Good. They say a big troll did it and ran away. Make of that what you will.”

“There might be some protests about Sally, sir,” said Carrot.

“Why? Will they spot she’s a vampire?”

“No, sir, I don’t think they—”

“Then don’t tell ’em,” said Vimes. “You’re the…smelter, it’s up to you what, er, tools you use. Seen this?”

He waved the report about the three officers he was trying not to think of as deserters.

“Yes, sir. I was meaning to talk to you about that. It might help if we changed the patrols a bit,” said Carrot.

“How do you mean?”

“Er…it would be quite easy to arrange the patrol schedules so that trolls and dwarfs don’t have to go on the beat together, sir. Um…some of the lads say they’d be a bit happier if we could…”

Carrot let the sentence die away in the stony glare.

“We’ve never paid any attention to an officer’s species when we do the roster, Captain,” said Vimes coldly. “Except for the gnomes, of course.”

“There’s your precedent, then—” Carrot began.

“Don’t be daft. A typical gnome room is about twice the size of a shoebox, Captain! Look, you can see this idea is nuts. Dangerous nuts, too. We’d have to patrol troll with troll, dwarf, with dwarf and human with human—”

“Not necessarily, sir. Humans could patrol with either of the others.”

Vimes rocked his chair forward. “No, they couldn’t! This is not about common sense, this is about fear! If a troll sees a dwarf and a human patrolling together, he’ll think: ‘There’s the enemy, two against one.’ Can’t you see where this is going? When a copper’s in a tight corner and blows his whistle for backup, I don’t want him demanding that when it arrives it’s the right damn shape!” He calmed down a little, opened his notebook, and tossed it on the desk. “And talking of shapes, do you know what this means? I spotted it in the mine, and a dwarf called Helmclever scrawled it with some spilt coffee, and you know what? I think he was only half-aware that he’d done it.”

Carrot picked up the notebook and regarded the sketch solemnly for a moment.

“Mine sign, sir,” he said. “It means ‘The Following Dark.’ ”

“And what does that mean?”

“Er…that things are pretty bad down there, sir,” said Carrot earnestly. “Oh dear.” He put the notebook down slowly, as if half-afraid that it might explode.

“Well, there has been a murder, Captain,” Vimes pointed out.

“Yes, sir. But this might mean something worse, sir. Mine sign is a very strange phenomenon.”

“There was a sign like it over the door, only there was just one line and it was horizontal,” Vimes added.

“Oh, that’d be the Long Dark rune, sir,” said Carrot dismissively. “It’s just the symbol for a mine. Nothing to worry about.”

“But this other one is? Is it anything to do with grags sitting in a room surrounded by lighted candles?”

It was always nice to surprise Carrot, and this time he looked amazed. “How did you work that out, sir?”

“It’s only words, Captain,” said Vimes, waving a hand. “ ‘The Following Dark’ doesn’t sound good. Time to stay brightly lit, maybe? When I met them, they were surrounded by candles. I thought maybe it was some kind of ceremony.”

“Could be,” Carrot agreed, carefully. “Thank you for this, sir. I’ll go prepared.”

As Carrot reached the door, Vimes added, “One thing, Captain?”

“Yes, sir?”

Vimes didn’t look up from the sandwich, from which he was daintily separating fragments of the L and the T from the crispy B.

“Just remember you’re a copper, will you?” he said.