“Well, then, in the dreams, when you're being chased by dogs or flying or whatever… who is it that's doing that? It's not your body, 'cos that's asleep. So it must be an invisible part that lives inside you, yes? And being dead is like being asleep, isn't it?”

“Not exactly like asleep,” said a rat, uncertainly, glancing at the fairly flat thing formerly known as Fresh. “I mean, you don't get all blood and bits sticking out. And you wake up.”

“So,” said the rat who'd raised the whole question about the invisible part, “when you wake up, where does the dreaming part go? When you die, where does that bit that's inside you go?”

“What, the green wobbly bit?”

“No! The bit that's behind your eyes!”

“You mean the pinky-grey bit?”

“No, not that! The invisible bit!”

“How would I know? I've never seen an invisible bit!”

All the rats stared down at Fresh.

“I don't like this kind of talk,” said one of them. “It reminds me of the shadows in the candlelight.”

Another one said, “Did you hear about the Bone Rat? It comes and gets you when you're dead, they say.”

“They say, they say,” muttered a rat. “They say there's a Big Rat Underground who made everything, they say. So it made humans, too? Must be really keen on us, to go and make humans too! Huh?”

“How do I know? Maybe they were made by a Big Human?”

“Oh, now you're just being silly,” said the doubting rat, who was called Tomato.

“All right, all right, but you've got to admit that everything couldn't have just, well, turned up, could it? There's got to be a reason. And Dangerous Beans says there's things we should do 'cos they're right, well, who works out what's right? Where does ‘right’ and ‘wrong’ come from? They say, if you've been a good rat, maybe the Big Rat has got this tunnel full of good eating that the Bone Rat will take you to”

“But Fresh is still here. And I ain't seen a bony rat!”

“Ah, but they say you only see it if it's coming for you.”

“Oh? Oh?” said another rat, nervous to the point of mad sarcasm. “So how did they see it, eh? Tell me that! Life's bad enough as it is without having to worry about invisible things you can't see!”

“All right, all right, what's been happening?”

The rats turned, suddenly incredibly pleased to see Darktan scurry up the tunnel.

Darktan pushed past. He'd brought Nourishing with him. It was never too soon, he said, for a member of the squad to find out what happened to people who got things wrong. “I see,” he said, looking at the trap. He shook his head sadly. “What do I tell everyone?”

“Not to use tunnels that haven't been marked clear, sir,” said Tomato. “But Fresh, well, he's not a… he never was a good listener. And he was keen to get on with it, sir.”

Darktan examined the trap, and tried to keep his face fixed in an expression of confident purpose. It was hard to do it, though. He'd never seen a trap like it. It looked a really nasty one, a squeezer rather than a chopper. It had been put where a rat hurrying to the water would be bound to trip it.

“He's not going to do any more listening now, that's for certain,” he said. “The face looks familiar. Apart from the bulging eyes and the tongue hanging out, that is.”

“Er, you talked to Fresh in the muster this morning, sir,” said a rat. “Told him he was raised to be a widdler and to get on with it, sir.”

Darktan's expression remained blank. Then he said, “We've got to go. We're finding a lot of traps all over. We'll work our way back to you. No-one is to go any further along that tunnel, understood? Everyone say ‘yes, Darktan’!”

“Yes, Darktan,” the rats chorused.

“And one of you stand guard,” said Darktan. “There could be more traps up that way.”

“What shall we do with Fresh, sir?” said Tomato.

“Don't eat the green wobbly bit,” said Darktan, and hurried off.

Traps! he thought. There were too many of them. And too much poison. Even the experienced members of the squad were getting nervous now. He didn't like to come across unknown things. You found out what unknown things were when they killed you.

The rats were spreading out under the town, and it was like no other town they'd found. The whole place was a rat trap. They hadn't found a single living keekee. Not one. That wasn't normal. Everywhere had rats. Where you got humans, you got rats.

And on top of everything else the young rats were spending too much time worrying about… things. Things you couldn't see or smell. Shadow things. Darktan shook his head. There was no room in the tunnels for that sort of thinking. Life was real, life was practical, and life could get taken away really quickly if you weren't paying attention…

He noticed Nourishing looking around and sniffing the air as they trotted along a pipe.

“That's right,” he said approvingly. “You can't be too careful. Never rush in. Even the rat in front of you might have been lucky and missed the trigger.”

“Yes, sir.”

“Don't worry too much, though.”

“He did look awfully… flat, sir.”

“Fools rush in, Nourishing. Fools rush in…”

Darktan could sense the fear spreading. It worried him. If the Changelings panicked, they'd panic as rats. And the tunnels in this city were no place for a terrified rat to be running. But if one rat broke ranks and ran, then most of them would follow. Smell held sway in the tunnels. When things went well, everyone felt good. When fear arrived, it flowed through the runs like flood-water. Panic in the rat world was a kind of disease that could be caught too easily.

Things did not get any better when they caught up with the rest of the trap-squad. This time, they'd found a new poison.

“Not to worry,” said Darktan, who was worried. “We've come across new poisons before, right?”

“Not for ages,” said a rat. “Remember that one in Scrote? With the sparkly blue bits? It burned if you got it on your feet? People ran into it before they knew?”

“They've got that here?”

“You'd better come and see.”

In one of the tunnels a rat was lying on its side. Its feet were curled up tight, like fists. It was whimpering.

Darktan took one look and knew that, for this rat, it was all over. It was only a matter of time. For the rats back in Scrote, it had been a matter of horrible time.

“I could bite her in the back of the neck,” a rat volunteered. “It'd be all over quickly.”

“It's a kind thought, but that stuff gets into the blood,” said Darktan. “Find a snapper trap that hasn't been made safe. Do it carefully.”

“Put a rat in a trap, sir?” said Nourishing.

“Yes! Better die fast than slow!”

“Even so, it's—” the rat who had volunteered to do the biting started to protest.

The hairs around Darktan's face stood out. He reared up and showed his teeth. “Do what you're told or I'll bite you!” he roared.

The other rat crouched back. “All right, Darktan, all right…”

“And warn all the other squads!” Darktan bellowed. “This isn't rat-catching, this is war! Everyone's to pull back smartly! No-one touch nothing! We're going to—Yes? What is it this time?”

A small rat had crept up to Darktan. As the trap-hunter spun around, the rat crouched hurriedly, almost rolling on its back to show how small and harmless it was.

“Please, sir…” it mumbled.

“Yes?”

“This time we've found a live one…”