'Because,' said André, 'sometimes you have secret criminals.'

Granny almost smiled. 'That's a fact,' she said. She peered at the small engraving on the back of the badge. 'Says here "Cable Street Particulars"...'

'There aren't many of us,' said André. 'We've only just started. Commander Vimes said that, since we can't do anything about the Thieves' Guild and the Assassins' Guild, we'd better look for other crimes. Hidden crimes. That need Watchmen with... different skills. And I can play the piano quite well...,

'What kind of skills have that troll and that dwarf got?' said Granny. 'Seems to me the only thing they're really good at is standing around looking obvious and stupi­Hah! Yes...'

'Right. And they didn't even need much training,' said André. 'Commander Vimes says they're the most obvious policemen anyone could think of. Incidentally, Corporal Nobbs has got some papers to prove he's a human being.'

'Forged?'

'I don't think so.'

Granny Weatherwax put her head on one side. 'If your house was on fire, what's the first thing you'd take out of it?'

'Oh, Granny–' Agnes began.

'Hmm. Who set fire to it?' said André.

'You're a policeman, right enough.' Granny handed him his badge. 'You come to arrest poor Walter?' she said.

'I know he didn't murder Dr Undershaft. I was watching him. He was trying to unblock the privies all afternoon–'

'I've had proof that Walter isn't the Ghost,' said Agnes.

'I was almost sure it was Salzella,' said André. 'I know he creeps off to the cellars sometimes and I'm sure he's stealing money. But the Ghost has been seen when Salzella is perfectly visible. So now I think–'

'Think? Think?' said Granny. 'Someone thinking around here at last? How'd you recognize the Ghost, Mister Policeman?'

'Well... he's got a mask on...'

'Really? Now say it again, and listen to what you say. Good grief! You can recognize him because he's got a mask on? You recognize him because you don't know who he is? Life isn't neat! Whoever said there's only one Ghost?'

The figure ran through the shadows of the fly loft, cloak billowing around it. Nanny Ogg was outlined against the light, peering down.

She said, without turning her head: 'Hello, Mr Ghost. Come back for your saw, have you?'

Then she darted around behind the cable until she faced the shadow. 'Millions of people knows I'm up here! You wouldn't hurt a little old lady, would you? Oh, dear... me poor old heart!'

She keeled over backwards, hitting the floor hard enough to make the cable swing.

The figure hesitated. Then it took a length of thin rope from a pocket and advanced cautiously towards the fallen witch. It knelt down, wound an end of the rope around each hand, and leaned forward. ,

Nanny's knee came up sharply.

'Feels a lot ‑better now, mister,' she said, as he reared backwards.

She scrambled up again and grabbed the saw.

'Come back to finish it, eh?' she said, waving the implement in the air. 'Wonder how you'd blame that on Walter! Make you happy, would it, the whole place burning down?'

The figure, moving awkwardly, backed away as she advanced. Then it turned, lurched along the wobbling catwalk and disappeared into the gloom.

Nanny pounded after him and saw the figure climbing down a ladder. She looked around quickly, grabbed a rope to slide after him, and heard a pulley somewhere above start to clatter.

She descended, skirts billowing around her. When she was about halfway down, a bunch of sandbags went upwards past her in a hurry.

As she rattled onwards she saw, between her boots, someone struggling with the trapdoor to the cellars.

She landed a few feet away, still holding the rope.

'Mr Salzella?'

Nanny stuck two fingers in her mouth and let out a whistle that could have melted ear‑wax.

She let go of the rope.

Salzella glanced up at her as he raised the trapdoor, and then saw the shape dropping out of the roof.

One hundred and eighty pounds of sandbag hit the door, slamming it shut.

'Watch out!' said Nanny, cheerfully.

Bucket waited nervously in the wings. Unnecessarily nervously, of course. The Ghost was dead. There couldn't be anything to worry about. People said they'd seen him killed, although they were, Bucket had to admit, a bit hazy on the actual details.

Nothing to worry about.

Not a thing.

Nothing whatsoever in any way.

Everything was absolutely nothing to worry about in any way.

He ran a finger around the inside of his collar. It hadn't been such a bad life in wholesale cheese. The most you had to worry about was ogle of poor old Reg Plenty's trouser buttons in the Farmhouse Nutty and the time young Weevins minced his thumb in the stirring machine and it was only by luck they happened to be doing strawberry yoghurt at the time–

A figure loomed up beside him. He clutched at a curtain for support and then turned to see, with relief, the majestic and reassuring stomach of Enrico Basilica. The tenor looked magnificent in a huge cockerel costume, complete with giant beak, wattles and comb.

'Ah, senor,' Bucket burbled. 'Very impressive, may I say.'

'Si,' said a muffed voice from somewhere behind the beak, as other members of the company hurried past on to the stage.

'May I say how sorry I am about all that business earlier. I can assure you that it doesn't happen every night, ahahah...'

'Si?'

'Probably just high spirits, ahaha...'

The beak turned towards him. Bucket backed away.

'Si!'

'...yes... well, I'm glad you're so understanding...'

Temperamental, he thought, as the tenor strode on to the stage and the overture to Act Three drifted to its close. They're like that, the real artistes. Nerves stretched like rubber bands, I expect. It's just like waiting for the cheese, really. You can get really edgy waiting to see whether you've got half a ton of best blue‑vein or just a vat full of pig food. It's probably like that when you've got an aria working its way up–

'Where'd he go? Where'd he go?'

'What? Oh... Mrs Ogg...'

The old woman waved a saw in front of his face. It was not, in Mr Bucket's current state of mental tension, a helpful gesture.

He was suddenly surrounded by other figures, equally conducive to multiple exclamation marks.

'Perdita? Why aren't you on stage... oh, Lady Esmerelda, I didn't see you there, of course if you want to come backstage you only have to–'

'Where's Salzella?' said André.

Bucket looked around vaguely. 'He was here a few minutes ago... That is,' he said, pulling himself together, 'Mr Salzella is probably attending to his duties somewhere which, young man, is more than I can say for–'

'I demand you stop the show now,' said André.

'Oh, you do, do you? And by what authority, may I ask?'

'He's been sawing through the rope!' said Nanny.

André pulled out a badge. 'This!'

Bucket looked closely. ' "Ankh‑Morpork Guild of Musicians member z 244"?'

André glared at him, then at the badge, and started to pat his pockets urgently. 'No! Blast, I know I had the other one a moment ago... Look, you've got to clear the theatre, we've got to search it, and that means–'

'Don't stop the show,' said Granny.

'I won't stop the show,' said Bucket.

' 'Cos I reckon he'd like to see the show stopped. The show must go on, eh? Isn't that what you believe? Could he have got out of the building?'

'I sent Corporal Nobbs to the stage‑door and Sergeant Detritus is in the foyer,' said André. 'When it comes to standing in doorways, they're among the best.'

'Excuse me, what's happening?' said Bucket.