But when it came to the conversations, people took a great deal of care. Most plainants came in with their master, or a ­steward sent by the master. And there must be some kind of legal training, even if there was no written law—slaves having no rights, except the right to petition. Make sure you say this, the master would whisper. She really meant to say, not that, but this, a steward would explain, as the plainant sat there nodding. Yes, yes, that is what I meant.

After the plainant was done, Rigg could either send for the misbehaver—there was no presumption of innocence—or simply announce his decision. Sometimes he was tempted to decide against someone whose complaint sounded frivolous, or for someone who was clearly sincere in her grievance. But his expectations from the customs of Stashiland—laws and practices older than the Sessamids and certainly older than the People’s Revolution—made this impossible for him.

Every time, he learned something important from the misbehaver. Sometimes it became clear that the actual complaint was merely an excuse for bringing the misbehaver before the Wallman. One swaggering overseer was arrogantly dismissive of the complaint—that he was always rude to the woman in question, even though she tried to serve him well. “She’s clumsy, she’s stupid, and she doesn’t even try,” he said. “I’m wasting time I owe to my master, so she not only costs him what she eats without producing anything of worth, now she’s making me less productive.”

Rigg saw at once that the man was blustering to hide some kind of shame. There was something he didn’t want to get caught at. At first Rigg thought it might be that the man was unkind to many other servants, and only this one had the courage to come forward. But it would actually be strangely to his credit if he was equally rude to everyone, instead of singling this one out.

“If you don’t mind sitting here for a moment,” said Rigg, “I’d like to think about something.”

“No, no, I don’t mind,” said the overseer, because what else could he say to a Wallman?

Rigg kept his eyes calmly fixed on the overseer’s face, but in fact his attention was directed elsewhere. He followed the overseer’s path backward in time. The little factory that he managed was only half a kilometer away, and Rigg studied his pattern of movement through the past day. Two days. Three.

“You’re not a very hardworking man,” said Rigg. It had taken him only about a minute to do this examination, because the facemask made everything go so much more quickly.

“I work as hard as I should!”

“It seems to me that you hardly visit the factory floor.”