Thud!

Koom Valley. And the night we arrived, you went for a little fly-around. Just stretching your wings?”
    “Look, this isn’t my life!” said Sally. “I’d joined the new force in Bonk. We’re trying to make a difference up there! I did want to come to Ankh-Morpork anyway, because, well, we all want to. To learn, you know? How you manage to do it? Everyone speaks highly of you! And then the Low King summoned me and I thought, where’s the harm? Hamcrusher has caused trouble up there, too. Er…I never actually told you a lie, sir.”
    “Rhys already knew about the Secret, right?” said Vimes.
    “No, sir, not as such. But I think he had some reason to suspect there was something down there.”
    “Then why didn’t he just go and look?”
    “Dwarfs digging around in Koom Valley? The trolls would, er, go postal, sir.”
    “But not if the dwarfs were merely investigating why a copper from Ankh-Morpork was chasing some fleeing criminals into the caves, right? Not if the copper was good ol’ Sam Vimes, who, everyone knows, is as straight as an arrow even if he’s not the sharpest knife in the drawer. You can’t bribe Sam Vimes, but why bother when you can pull the wool over his eyes?”
    “Look, sir, I know how you must feel, but…well, there’s your litle boy there, playing in Koom Valley, with trolls and dwarfs all ’round, and they’re not fighting. Right? I didn’t lie, I just…liaised a little. Wasn’t it worth it, sir? Hah, you really worried them when you went to the wizards! Shine hadn’t left the city! Rhys had to fly him in by night! All they really did was follow your lead. The only person who fooled you was me, and it turns out I wasn’t very good at it. They needed you, sir. Look around and say it wasn’t worth it…”
    A hundred yards away, a house-sized rock rumbled across the stone, pushed and steered by a dozen trolls, dropped into a sinkhole and blocked it like an egg in a cup. There was a cheer.
    “Can I mention something else, sir?” said Sally. “I do know Angua is standing behind me.”
    “It’s Sergeant Angua to you,” said Angua, by her ear. “You didn’t fool me, either. I told you we didn’t like snitches in the Watch. But for what it’s worth, sir, she smells like she’s telling the truth.”
    “Do you still have a route to the Low King?” said Vimes.
    “Yes, and I’m sure he’ll—” Sally began quickly.
    “These are my demands. The grags and what’s left of their guards are coming back to Ankh-Morpork with me. That includes Ardent, though I’m told it’ll be weeks before he can talk again. They’re going before Vetinari. I’ve got promises to keep, and no one is going to stop me. It’ll be tough to make any big charges stick, but I’m bloody well going to try. And since I’ll bet my dinner that Vetinari is in on all this, I expect he’ll pack ’em off back to Rhys in any case. I imagine he’s got a cell that’s deep enough for comfort. Understood?”
    “Yes, sir. And the other demands?”
    “The same as that one, repeated in a louder voice,” said Vimes. “Understood?”
    “Absolutely, sir. Then I’ll resign, of course,” said Sally.
    Vimes’s eyes narrowed. “You’ll resign when I tell you to, Lance Constable! You took the King’s Shilling, remember? And made an oath. Go and liaise!”
    “You’re going to keep her?” said Angua, watching the vampire disappear into the distance.
    “You said yourself she’s a good copper. We’ll see. Oh, don’t make that face, Sergeant. It’s all the rage in politics these days, spying on your friends. That’s what I’m told. Like she said: look around.”
    “This is a bit unlike you, sir,” said Angua, giving him a look of concern.
    “Yes, it is, isn’t it?” said Vimes. “I had a nice sleep last night. It’s a nice day. No one is actively trying to kill me, which is nice. Thank you, Sergeant. Have a nice evening.”
    Vimes carried Young Sam back in late-afternoon light. Just as well the girl had been working for Rhys. Things might have been a bit tricky otherwise. That was the plain fact of it. Keep her on? Maybe. She’d been very useful, even Angua admitted. Besides, he’d been practically forced to take on a spy, in times of more-orless war! If he played that right, no one would ever again dictate to him who he took on in the Watch. Doreen Winkings could rattle her false canines as much as she liked!
    Hmm…was this how Vetinari thought all the time ?
    He heard his name