The council filed in.

'Cruces' office was the biggest room in the building. It always seemed wrong to visitors that the Assassins' Guild had such light, airy, well-designed premises, more like the premises of a gentlemen's club than a building where death was plotted on a daily basis.

Cheery sporting prints lined the walls, although the quarry was not, when you looked closely, stags or foxes. There were also group etchings – and, more recently, new-fangled iconographs – of the Guild, rows of smiling faces on black-clad bodies and the youngest members sitting cross-legged in front, one of them making a face.[6]

Down one side of the room was the big mahogany table where the elders of the Guild sat in weekly session. The other side of the room held Cruces' private library, and a small workbench. Above the bench was an apothecary cabinet, made up of hundreds of little drawers. The names on the drawer labels were in Assassins' code, but visitors from outside the Guild were generally sufficiently unnerved not to accept a drink.

Four pillars of black granite held up the ceiling. They had been carved with the names of noted Assassins from history. Cruces had his desk foursquare between them. He was standing behind it, his expression almost as wooden as the desk.

'I want a roll-call,' he snapped. 'Has anyone left the Guild?'

'No, sir.'

'How can you be so sure?'

'The guards on the roofs in Filigree Street say no-one came in or went out, sir.'

And who's watching them?'

'They're watching one another, sir.'

'Very well. Listen carefully. I want the mess cleaned up. If anyone needs to go outside the building, I want everyone watched. And then the Guild is going to be searched from top to bottom, do you understand?'

'What for, doctor?' said a junior lecturer in poisons.

'For . . . anything that is hidden. If you find anything and you don't know what it is, send for a council member immediately. And don't touch it.'

'But doctor, all sorts of things are hidden—'

'This will be different, do you understand?'

'No, sir.'

'Good. And no-one is to speak to the wretched Watch about this. You, boy . . . bring me my hat.' Dr Cruces sighed. 'I suppose I shall have to go and tell the Patrician.'

'Hard luck, sir.'

The captain didn't say anything until they were crossing the Brass Bridge.

'Now then, Corporal Carrot,' he said, 'you know how I've always told you how observation is important?'

'Yes, captain. I have always paid careful attention to your remarks on the subject.'

'So what did you observe?'

'Someone'd smashed a mirror. Everyone knows Assassins like mirrors. But if it was a museum, why was there a mirror there?'

'Please, sir?'

'Who said that?'

'Down here, sir. Lance-Constable Cuddy.'

'Oh, yes. Yes?'

'I know a bit about fireworks, sir. There's a smell you get after fireworks. Didn't smell it, sir. Smelled something else.'

'Well . . . smelled, Cuddy.'