Matthew 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 over 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 passers-by, a fat man in a brown bowler hat and a dark suit that was showing its age, stopped and extended a hand to Matthew as if to help him. Matthew backed away. He didn’t want charity. Charity led to the workhouse 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 to 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 and then flowing sideways to a drainpipe where it turned and slid up towards the roof. Hunger forgotten, Matthew watched open-mouthed as the cloud drifted over the sharp edge of the roof tiles and vanished out of sight.

A scream split the silence — a scream from the open window — and Matthew 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 Matthew’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.