It was easy to know which way to go. Tab followed the buzzing in her head as it changed pitch. At the end of the alley she turned right, then left, then right again. She saw two sky-traders heading her way and ducked into one of the dome-shaped buildings. It was stacked high with bolts of fabric – an easy place to hide.

After the sky-traders passed she followed a few more alleys until she found an odd contraption at the base of a mast that she had never seen before. After experimenting with it for a while she could see that it ran on a counterweight system, similar to the one that operated the portcullis on Quentaris's City Gate. The small platform would carry you up the mizzenmast, past the next level of lanes, and on up to the crossjack.

She pushed the lever and headed up to the next storey. Here the buzzing in her head was much louder, and she squeezed her eyes shut against the pain as the platform rose up. She stepped out and followed the ache over the footbridge. She stumbled along until she reached a door. Tab pressed her hand against the door, and the ache in her head thrummed.

Stepping back she looked up at the pyramid-shaped building. There was an opening about halfway up. If she climbed up there she would be able to see inside. She would have to be quick. Although there weren't many sky-traders in the streets, there were others in the rigging and it was only a matter of time before one of them looked down and saw her spying. Tab shimmied up as quietly as she could. She gripped the edge of the window, feeling all the muscles in her shoulders straining.

Inside three sky-trader magicians sat cross-legged on the floor. Between them was a metal tray full of coloured sand. One drew symbols in the sand with her fingers, while the others chanted incantations.

Tab felt her hand slip. Her other hand shook with the strain of holding her whole weight. Her foot thumped against the side of the building as she struggled to hang on. One of the magicians looked around, her concentration broken.