They retraced their steps through the winding streets of Murkside. It was Skullday, a shopping day, and elsewhere in the city the crowds would be thick. But in Murkside the shops were mean and poor. Those locals for whom Skullday was a day off would make their way to Griss Fell or the Aspic Hole market. Lemuel and Yagharek were not watched by many.

Yagharek sped up, hobbling on bound feet with a weird, crippled gait to keep up with Lemuel. They made their way south-east, staying in the shadow of the raised railway lines, moving towards Syriac.

This is how I came to the city, thought Yagharek, tracking the great iron pathways of the trains.

They passed under the brick arches, retracing their way into a little enclosed space overlooked on three sides by featureless brick. Storm drains channelled down the walls, along concrete ruts and into a man-sized grille in the centre of the yard.

On the fourth side, the south-facing side, the courtyard looked out onto a drab alley. The land fell away before it. Syriac sat in a depression in the underlying clay. Yagharek looked out over a tumbledown roofscape of twisted roofs and mouldering slate, curlicues of brick and forgotten, warped weathervanes.

Lemuel glanced around to ensure their privacy, then tugged the grille free. Fingers of fell-gas curled out and tugged at them. The heat made the stink rich. Lemuel gave his bags to Yagharek and pulled a primed pistol from his belt. Yagharek looked at him from under the hood.

Lemuel turned with a hard smile and said: “I’ve been pulling in favours. Got us kitted out.” He waggled the gun to illustrate his point. He checked it, hefted it expertly. He pulled the oil-lamp from a bag, lit it and lifted it with his left hand.

“Stay behind me,” he said. “Keep your ears open. Move quietly. Watch your back.”

With that, Lemuel and Yagharek descended into the dirt and the dark.

There was an indeterminable time wading through the warm, rank darkness. The sounds of scuttling and swimming were all around them. Once they heard vicious laughter from a tunnel parallel to theirs. Twice Lemuel swung round, aiming the torch and his pistol at a patch of filth still rippling from where some unseen thing had been. He did not have to shoot. They were unmolested.

“You know how lucky we were?” said Lemuel conversationally. His voice bobbed slowly back to Yagharek on the foetid air. “I don’t know if it was deliberate, where the Weaver left us, but we’re in one of the safest places in the New Crobuzon sewers.” His voice stiffened now and then with effort or disgust. “Murkside’s such a backwater, you don’t have much food down here, you’ve got no thaumaturgic residues, there aren’t any massive old chambers to support a whole brood . . . It’s not very busy.”

He was silent for a moment, then continued.