He stumbled out between two fancy buildings onto a wide, clean street he knew he should recognise, and yet it seemed odd, out of place … until it snapped in focus.

He’d come out only three blocks from his family’s town house, where his mother and father took such pains looking gentrified. If he was seized here, there’d be some who’d know him on sight, and that would mean much, much worse for not just him; his whole family would be brought down. He had to get out of here. Now.

He rushed out into the street, directly under the wheels of a steam carriage, and into the darkness of another alley. It led in the right direction, but twisted wrong soon enough. He’d not explored all the alleys near his home; he had enough to do with the routes the runners used. That was why his father had always ordered him to keep to the route – because it was so easy to be lost in complicated London, and getting lost while carrying contraband could be deadly.

At the next street he spotted a landmark a few blocks away: the glittering dome of St Paul’s Serapeum, the physical presence of the Great Library in London, and one of the largest daughter libraries in Europe. It was beautiful and deadly, and he averted his eyes and made a vow to never, never go that way.

But he didn’t have a choice.

A Garda emerged from a doorway, clapped eyes on him, and shouted. Behind his pointing finger the Garda was young, maybe the age Liam had been when he’d taken the rope. This young man was blond and had a weak chin, and his second-hand uniform fit about as well as Jess’s disguise.

But he was fast. Too fast. As Jess took off running he heard the slap of the Garda’s feet behind him, and the shrill, urgent toot of his whistle. They’d be coming from all around him. If they boxed him in here …

He took the only clear path out of danger. It was another dark, cramped alley, but the Garda was no side of beef, and slipped through almost as easily as Jess did. Jess had to keep running, though his weary lungs were pumping fire, and the long legs of the Garda gained on him when they reached open street again. The watery London sunshine seemed to beat down on Jess’s head, and he was dripping with sweat. He was terrified that he might damage the book with it.

Not as terrified as he was of being caught, though.

More whistles. The Garda closed in.

Jess had no choice at all. They were driving him in one direction – towards the Serapeum. If he could get past the Garda barricades there, it was Library territory, and under entirely different laws. The London Garda couldn’t trespass without clearances.

Up ahead, he saw the orange-and-black wood of the Garda barricade across the street, and the line of supplicants waiting to have their credentials checked. Jess pulled for his last reserves of speed, because that damned rabbit-heeled Garda was close enough to brush fingers on his shirt. He lurched forward, aimed for a hole in the crowd, and threw himself bodily forward towards the barricade. As the Garda behind him yelled for help, Jess grabbed the painted tiger-striped wood and vaulted over it in one smooth motion, hit the ground running on the other side, and heard the shouts of surprise and dismay echoing behind him. Someone laughed and yelled at him to keep going, and he grinned fiercely and risked a look back.

The Garda had stopped at the barricade – or, at least, one of his fellows had stopped him by getting in his way and holding him back. The two were scuffling, the younger man shouting angrily. His blood was still up from the chase, or he’d have had more sense. Jess knew he didn’t have long; they’d be sending a message to the High Garda, the elite guards of the Library, to intercept him. He needed to get through, and fast.

The street ahead had but maybe fifty people on foot, including at least ten Scholars stalking in their billowing black robes. No steam carriages; they weren’t permitted here any more, not since they’d closed this road to through traffic. The golden dome rose up serene and gleaming overhead, and below it, a waterfall of steps flowed down from it.

There were still scars on the steps, despite all efforts to clean it, from the last Burner explosion. Stains from the Greek Fire and the burnt bodies of those who’d been killed. A mound of dying flowers marked the spot, though a groundsman was in the process of shoving them into a bag for disposal. The mourning period was over. Time to move on.

Jess slowed to a jog as he caught sight of the lions. Stone, they resembled, but they had the feral look of life – something caught in a moment of violence, of fury and blood and death about to spring. He’d heard of the automata, machines that moved on their own, but they were far, far more terrifying in person, now that he was close enough to really see them.

Jess risked another look behind. The London Garda would be organising men to meet him beyond the barriers on the other side, if the High Garda of the Library didn’t bestir themselves to get him first. He needed to run, quick as lightning, but despite that knowledge his feet slowed down to a walk.

He was smothered by dread. Fear. A horrible sense of being hunted.

And then one of the automaton lions turned its head towards him. The eyes shone red. Red like blood. Red like fire.

They could smell it on him, the illegal book. Or maybe just his fear.

Jess felt a wash of cold terror so strong it almost loosened his bladder, but he somehow managed to hold the lion’s fiery gaze as he kept walking on. He left the pavement and took to the middle of the street where the authorised pedestrians seemed more comfortably gathered, and hoped to hide himself from those feral eyes.

The lion rose from its haunches, shook itself, and padded down the steps, soundless and beautiful and deadly. The other beasts woke, too, their eyes flickering red, bodies stretching.

A woman on the street – someone who’d been passed through the checkpoint – shrieked in alarm, clutched her bag, and ran for it. The others caught the fever and ran, too, and Jess ran with them, hoping they’d cover him like cutters even though they didn’t know they were part of his gang.

When he glanced back, two lions were loping behind them. They weren’t hurrying. They didn’t have to work very hard to overtake mere humans.

The first lion reached the laggardmost of the fleeing people – a female Scholar, dressed in clumsy robes and burdened with a heavy bag that she’d foolishly not abandoned – and leapt. Jess paused, because it was the most graceful and horrible thing he’d ever seen, and he saw the woman look back and see it coming and the horror on her face, her shriek cut short as the lion’s bulk crushed her down …

… but the lion never took its eyes off of Jess. It killed her and left her and came on, straight for him. He could hear the whir and click of the gears inside.

He didn’t have time to feel the horror.

He’d thought he’d run himself flat out before, but now, now, seeing the death that was at his heels, Jess flew. He felt nothing but the pressure of the wind; he knew there was a crowd around him screaming for help and mercy, but he heard none of it. At the far end of the street stood the other Garda barrier, another crowd of people waiting for their turn, but that crowd was starting to scatter. The lions weren’t supposed to chase anyone past the boundaries of St Paul’s, but nobody was going to take that risk. Not even the Garda, who abandoned their stations with the rest.

Jess was the first to the barricade, and he vaulted over it as the lions caught and crushed two more behind him. He tripped and fell and knew, knew he would feel death on him in the next heartbeat. He flipped over on his back so he could see it coming, gagged for breath, and held up his hands in an entirely useless defence.