Proserpina doesn’t have to make a rousing speech; she doesn’t have to draw a line in the sawdust. “Iala, you owe me,” she says. “Radiane. Ernestine. The rest of you can join us or not. I wouldn’t.”

And in fact, of the core group, four decline. But lumpy, awkward Euphrania Dowell volunteers, as does Emily-Jane Northup, their only third-year. So, to some surprise, does Georgette. Two glances between her and Radiane tell Proserpina everything.

“I don’t suppose we’re waiting for a moonless night to go skulking into the horrid place,” says Iala dryly.

“No,” says Proserpina, “for visiting hours.”