And that was just the stuff I recognised. Many of the items acquired from future travellers turn out to be technology so advanced or obscure that what they're for or even what they do is anybody's guess. Buyer beware; but then that's business as usual in the Nightside.

There was a tiny armchair, backed by a big brass wheel, with a bent cigar sitting in it, some kind of glowing lens,

and a small black box that shook and growled menacingly when you tried to turn it on. The trader was very keen to hawk a philosopher's stone that could turn lead into gold, but I'd encountered it before. The stone could transmute the elements all right, but the changing atomic weight meant you ended up with extremely radioactive gold. A man kneeling beside me held up a phial full of a shimmering rainbow liquid.

"What does this do?" he challenged the trader, who grinned cheerfully.

"That, squire, is your actual immortality serum. One sip, and you live forever."

"Oh come on!" said the doubtful buyer. "Can you prove it?"

"Sure; drink it and live long enough to find out. Look, squire, I only sell the stuff. And before you ask, no, I don't do guarantees. I don't even guarantee I'll be here tomorrow. Now if you're not going to buy, make room for someone who will." He looked hopefully at me. "How about you, sir? You look like a man who knows a bargain when he sees one."

"I do," I admitted. "And I also know the Borealis Accelerator when I see it. One sip of that stuff will make you immortal, but I have read the small print that usually accompanies the phial. The bit that says, Drink me and you'll live forever. You'll be a frog, but you'll live forever."

The other customer quickly dropped the phial back into the suitcase, and hurried away. The street trader shrugged, not bothered. He knew there'd be another sucker along in a moment. "Well, how about this, squire? A jet pack you strap on your back. Fly like a bird, only without all that onerous flapping of arms. It glides, it soars, and, no, it doesn't come with a parachute."

A young man pushed forward, eager to try it out, and I made room for him. The trader haggled cheerfully over a

down payment, then strapped the hulking steel contraption to the young man's back. The two of them studied the complicated control panel for a while, then the young man shrugged and stabbed determinedly at the big red button in the centre. The jet pack blasted up into the night at speed, dragging the young man along with it, his legs kicking helplessly. His voice came drifting desperately down.

"How do I steer the bloody thing?"

"Experiment, squire, experiment!" shouted the trader, and he turned away to concentrate on his other customers.

One of them had already picked up a small, lacquered box, whose label boasted it could contain an infinity of things. I decided to step back. The customer opened the box, and, of course, it swallowed him right up. The box fell to the ground, and the trader picked it up again, scowling.