“Grimnebulin,” he whispered as softly as his avian throat allowed. “You are thinking of your friend David.”

Isaac turned sharply.

“No fucking friend of mine,” he countered.

“And yet he was. You are thinking of the betrayal.”

Isaac said nothing for several moments. Then he nodded. The look of horrified astonishment returned.

“I know betrayal, Grimnebulin,” whistled Yagharek. “I know it well. I am…sorry for you.”

Isaac turned away and walked brusquely to his laboratory space, began shoving bits and pieces of wire and ceramic and glass seemingly at random into a huge carpet bag. He strapped it, bulky and clanking, to his back.

“When were you betrayed, Yag?” he demanded.

“I was not. I betrayed.” Isaac stopped and turned to him. “I know what David has done. And I am sorry.”

Isaac stared in bewilderment, in denial and misery.

The militia attacked. It was only twenty minutes past seven.

The door flew open with a massive sound. Three militia officers came hurtling through into the room, their battering ram flying out of their hands.

The door was still unlocked from when David had fled. The militia had not expected this, and had tried to break down a door which did not resist them. They fell, sprawling and idiotic.

There was a confused moment. The three militia scrabbled to stand. Outside, the squad of officers gaped stupidly into the building. On the ground floor, Derkhan and Lemuel stared back at them. Isaac looked down at the intruders.

Then everyone moved.

The militia outside in the street recovered their wits and rushed the door. Lemuel flipped David’s huge desk onto its side and hunkered down behind the makeshift shield, priming his two long pistols. Derkhan ran towards him, diving for cover. Yagharek hissed and stepped backwards from the rail of the walkway, out of sight of the militia.

In one slick movement, Isaac turned to his laboratory work-table and scooped up two huge glass flasks of discoloured liquid, still spinning on his heels, and hurled them over the rail at the invading officers like bombs.

The first three militia through the door had regained their feet, only to be caught in the shower of glass and chymical rain. One of the massive jars shattered on the helmet of one officer, who hit the floor again, motionless and bleeding. Vicious shards bounced off the others’ armour. The two militia caught by the deluge were still for a moment, then began to shriek suddenly as the chymicals seeped through their masks and began to attack the soft tissues of their faces.

There was still no gunfire.

Isaac turned again and began to grab more jars, taking a moment to pick strategically, so that the effects of the cascading chymicals were not entirely random. Why don’t they shoot? he thought giddily.

The wounded officers had been pulled out into the street. In their place, a phalanx of heavily armoured officers had entered, bearing iron shields with reinforced glass windows through which they stared. Behind them, Isaac saw two officers getting ready to attack with khepri stingboxes.

They must want us alive! he realized. The stingbox could kill, easily, but it could also not. If deaths were all that were desired, it would have been far easier for Rudgutter to send conventional troops, with flintlocks and crossbows, than such rare agents as humans trained in stingbox.

Isaac hurled a double salvo of trow-iron dust and sanguimorph distillate at the defensive huddle, but the guards were quick, and the jars were shattered with twitching shields. The militia danced to avoid the dangerous gobbets.

Each of the two officers behind the shield-bearers spun their jagged twin flails.

The stingboxes themselves-metaclockwork engines of intricate and extraordinary khepri design-were attached to the officers’ belts, each the size of a small bag. Attached to each side was a long cord, thick wires swathed in metal coils, then insulating rubber, extendible more than twenty feet. About two feet from the end of each cord was a polished wooden handle, one of which each officer held in each hand. They used these to whirl the ends of the cords at terrible speed. Something glimmered almost invisibly. At the tip of each tendril, Isaac knew, was a vicious little metal prong, a weighted clutch of barbs and spikes. These tips varied. Some were solid, the best-made expanded like cruel flowers on impact. All were designed to fly heavy and true, to puncture armour and flesh, to grip without mercy inside torn flesh.

Derkhan had reached the table and was huddling by Lemuel. Isaac turned to grab more ammunition. In the moment of silence, Derkhan raised herself quickly on one knee and peered over the tip of the table, taking aim with her great pistol.

She pulled the trigger. At the same instant, one of the officers let fly with his stingbox.

Derkhan was a decent shot. Her ball flew into the viewing window of one of the militia shields, which she had judged its weak point. But she had underestimated the militia’s defences. The porthole cracked violently and spectacularly, whitened completely with shards of glassdust and a crack-lattice, but its structure was interlaced with copper wire, and it held. The militiaman staggered, then stood solid.

The officer with the stingbox moved like an expert.

He swung up his arms at the same moment in sweeping curves, flicking the little switches in the wooden handles that allowed the cords to slide through them, releasing them. The momentum of the twirling blades took them flying through the air in a flash of metallic grey.

Cord unravelled almost without friction from inside the stingbox, through the air and the wooden handles, slowing the blades hardly at all. Their curving flight was absolutely true. The jagged weights flew in a long, elliptical motion through the air, the curve shallowing rapidly as the cables attaching them to the stingbox extended.

The buds of sharpened steel smacked simultaneously into each side of Derkhan’s chest. She screamed and staggered, her teeth gritting as the pistol fell from her spasming fingers.

Instantly, the officer pressed the catch on his stingbox to release the pent-up clockwork within.

There was a sputtering whirr. The hidden coils of the motor began to unwind, twirling like a dynamo and generating waves of weird current. Derkhan danced and spasmed, agonized yells spurting out from behind her teeth. Little bursts of blue light exploded like whiplashes from her hair and fingers.

The officer watched her intently, twiddling the dials on his stingbox that controlled the intensity and form of the power. There was a violent, cracking jolt and Derkhan flew backwards against the wall, collapsing to the floor.

The second officer sent his sharp bulbs over the edge of the table, hoping to catch Lemuel, but he was flattened hard against the wood and they flew harmlessly around him. The officer pressed a stud and the cords rapidly retracted back into a ready position.

Lemuel stared at the stricken Derkhan and hefted his pistols. Isaac bellowed in rage. He hurled another vast pot of unstable thaumaturgic compound at the militia. It fell short, but burst with such violence that it splashed onto and over the shields, mixing with the distillate and sending two officers screaming to the floor as their skin became parchment and their blood ink.

An amplified voice burst through the door. It was Mayor Rudgutter’s.

“Stop these attacks. Be sensible. You aren’t going to get out. Stop attacking us and we will show mercy.”

Rudgutter stood in the midst of his honour guard with Eliza Stem-Fulcher. It was highly unusual for him to accompany a militia raid, but this was no ordinary raid. He was stationed across the road and a little way along from Isaac’s workshop.