“I know ve didn’t send that message to De Groot.”

“Yeah? How? ”

“Because I did. I sent it.” I stood up slowly, turning to face her, refusing to accept this ridiculous claim. The music from the square surged madly again, making the whole tent hum. She said, “I knew there were calculations in progress – but I thought they still had days to run. I had no idea we’d cut it so fine.”

My ears were ringing. Sarah watched me calmly, aiming the gun with unwavering conviction. She must have made contact with the extremists when she’d been researching Holding Up the Sky – and no doubt she’d intended to expose them, once she had the whole story. But they would have realized how valuable she could be to them – and before resorting to killing her, they would have tried everything possible to bring her round to their point of view.

And they’d succeeded. In the end, they’d convinced her to swallow it all: Any TOE would be an atrocity, a crime against the human spirit, an unendurable cage for the soul.

That was why she’d worked so hard to get Violet Mosala – and when she’d lost it, she’d had someone infect me with the cholera, modified to do the job indirectly. But they’d been sloppy with the timing provisions needed to accommodate the last minute change of plan.

Nishide and Buzzo she’d dealt with in person.

And I’d just destroyed every chance of trust, every chance of friendship, every chance of love I might have found with Akili. I’d beaten it all into the ground. I covered my face with my hands, and stood there wrapped in the darkness of solitude, ignoring her commands. I didn’t care what she did; I had no reason to go on.

Akili said, “Andrew. Do as she says. It’ll be OK.”

I looked at Sarah. She had the gun raised, and she was repeating angrily, “Call De Groot!”

I took out my notepad and made the call. I swept the camera around, to illustrate the situation. Sarah gave detailed instructions to De Groot, a procedure for transferring authority over Mosala’s supercomputer account.

De Groot seemed to be in shock at first, stunned to learn of Sarah’s allegiance; she complied with barely a word. Then her anger boiled to the surface, and she interjected sardonically, “All your resources and expertise, and you couldn’t even have an academic account hacked open?”

Sarah was almost apologetic. “Not for lack of trying. But Violet was paranoid, she had good protection.”

De Groot was incredulous. “Better than Thought Craft’s?”

“What?”