couldn’t see much past the shoulders of jostling cosmologists: a glimpse of green from the park, a washed-out blue sky. The window was sealed shut to allow the air-conditioning to work, but she thought she could hear a lot of traffic noise: the blaring of horns, sirens.
Toby Pitt spotted her at the back of the pack. A big, affable bear of a man with a strangulated Home Counties accent, Toby worked for the Royal Society; he was the manager of the conference today. “Siobhan! I won’t make jokes about the Astronomer Royal being the last to show any interest in the sky.”
She showed him her phone. “No need. My mother’s already been there.”
“It’s quite a view, though. Come and see.” He extended his massive arm around her shoulders and, with a skillful combination of physical presence and smiling tact, managed to shepherd her through the crowd to the window.
The City of London Rooms had a fine view of the Mall, and of St. James’ Park beyond. The grass of the park glowed lurid green, no longer a native specimen but a tough, thick-leaved drought-resistant breed imported from southern Texas, and the relentless sprinklers sent sprays of water shimmering into the air.
But the traffic in the Mall was jammed. The smart cars had calmly packed themselves up in an optimal queuing pattern, but their frustrated drivers were pounding at their horns, and heat haze rose in a shimmer in the humid air. Looking up the road Siobhan saw that the traffic control lights and lane guides were blinking, apparently at random: no wonder the traffic was snarled.
She looked up. The sun, riding high, flooded the cloudless air with light. Even so, when she shielded her eyes she could still make out a tracery of auroral bands in the sky. She became aware of a noise beyond the blare of the traffic in the Mall, a softer din, muffled by the thick sealed window. It was a growl of frustrated driving that seemed to be rising from across the city. This snarl-up wasn’t local, then.
For the first time that day she felt a flicker of unease. She thought of her daughter, Perdita, at college today. Perdita, twenty years old, was a sensible young adult. But still . . .
There was a new silence, a shift in the light. People stirred, perturbed. Glancing over her shoulder Siobhan saw that the room lights had failed. That subtle change in the ambient noise must mean the air-conditioning had packed up, too.
Toby Pitt spoke quickly into a phone. Then he held up his hands and announced, “Nothing to worry about, ladies and gentlemen. It isn’t just us; the whole of this part of London seems to be suffering something of a brownout. But we have a backup generator that should be coming online soon.” He winked at Siobhan and said softly, “If we can persuade the ratty old thing to start up in the first place.” But he raised his phone to his ear again, and concern creased his face.
In the heat of the June day, thirty-plus degrees Celsius, the room was already warming up, and Siobhan’s trouser suit was starting to feel heavy and uncomfortable.
From beyond the window there was a crumpling noise, a series of pops, like small fireworks, and a din of wailing car alarms. The cosmologists gasped, a collective impulse. Siobhan pushed forward to see.
That queue of traffic on the Mall was just as stationary as before. But the cars had lurched forward, each smashing into the one in front like a gruesome Newton’s cradle. People were getting out of their vehicles; some of them looked hurt. Suddenly the jam had turned from an orderly inconvenience into a minor disaster of crumpled metal, leaking lubricants, and scattered injuries. There was no sign of police or ambulances.
Siobhan was baffled. She had literally never seen anything like it. All cars nowadays were individually smart. They took data and instructions from traffic control systems and navigational satellites, and were able to avoid cars, pedestrians, and other obstacles in their immediate