Prologue

The first time Kim Jonghyun saw the cloud of death, it was floating out of the first-floor window of a house near where he was living.

He was scurrying along the High Street in the market of Farnham, looking for any fruit or crusts of bread that a careless passer-by might have dropped. His eyes should have been scanning the ground, but he kept looking up at the houses and the shops and at the thronging people around him. He was only fourteen, and as far as he could remember he’d never been in a town this large before. In this, the prosperous part of Farnham, the older wood-beamed buildings leaned over into the street, with their upper rooms looming like solid clouds above anybody underneath.

The road was cobbled with smooth, fist-sized stones for part of its length, but some distance ahead the cobbles gave way to packed earth from which clouds of dust rose up as the horses and the carts clattered past. Every few yards sat a pile of horse manure: some fresh and steaming, surrounded by flies; some dry and old, like strands of hay or grass that had been clumped together and somehow stuck.

Jonghyun could smell the steamy, putrid dung, but he could also smell baking bread and what might have been a pig that had been roasted on a spit above a roaring fire. He could almost see the fat dripping off and sizzling in the flames. Hunger made his stomach clench, and he nearly doubled with the sudden pain. It had been a few days since he’d had any proper food. He wasn’t sure how much longer he could go on.

One of the passer-by, a fat man in a brown bowler hat and a dark suit that was showing its age, stopped and extended a hand to Jonghyun as if to help him. Jonghyun backed away. He didn’t want charity. Charity led to the workshop or the church for a child with no family, and he didn’t want to start out on the path towards either of those destinations. He was doing fine by himself. All he had to do was find some food. Once he had some food inside him he would be fine.

He slipped away down an alley before the man could take his shoulder, then doubled back round a corner into a street that was so narrow that the upper storeys of the houses were almost touching. A person could climb straight from one bedroom to another on the other side of the street, if they had a mind to.

That was when he saw the cloud of death. Not that he knew what it was, then. That would come later. No, all he saw was a dark stain the size of a large dog that seemed to drift from an open window like smoke, but smoke that moved with a mind of its own, pausing for a moment then flowing sideways to a drainpipe where it turned and slid up towards the roof. Hunger forgotten, Jonghyun watched open mouthed as the cloud drifted over the sharp edge of the roof tiles and vanished out sight.

A scream split the silence – a scream from the open window – and Jonghyun turned and pelted back down the street as quickly as his malnourished legs would carry him. People didn’t scream like that when they’d had a surprise. They didn’t even scream like that if they’d had a shock. No, in Jonghyun’s experience people only screamed like that if they were in mortal fear of their life, and whatever had provoked that scream was not something he wanted to see.