When they wake up, she still isn't back.
[Jane?]
No response.
Kas teleports down to the Janepoint, Petaal wrapped snake-shaped around his shoulders.
The display reads: error 7788: lycanthropy
"...So that's new," he says.
"No shit," says Petaal. "Now what?"
He shrugs. She coils tighter.
"Hang around and wait, I guess."
It's four days later, with no Isabella walking through the door from Milliways, and no change in Jane, when a witch queen next shows up to meet with the revolutionary young witch (who is now, thanks to some savvy dead people, widely rumored to be responsible for the funny dreams everyone's been having about their loved ones). Queen Atassa Mikalmia knocks on the door.
He answers the door wearing sweatpants, a Queen T-shirt, and a frilly pink apron, with fox-shaped Petaal tucked into the apron pocket.
"Hi."
"She's not home," he repeats. "Something came up. I don't know when she'll be back. Could be ten minutes, could be ten years."
"Last I heard of her, she went to check on the afterlife," he says. "But that was days ago. I expected her back by now."
"Sure," says Kas. He grabs a notebook and pen out of a drawer that didn't contain a notebook and pen until just before he opened it. "You can have some muffins, too, if you want, I just baked 'em."
Kas goes to fetch the plate of muffins from the kitchen. When he comes back with it, the fox in his apron is a different colour - white instead of orange.
He takes a muffin for himself and hands one to Petaal. They stand around nomming contentedly.
He eats his muffin.
He changes his clothes.
He puts Isabella's alethiometer downstairs at the Janepoint and makes the room impassable and its contents inviolable to anyone but himself and his girlfriend.
He packs his own alethiometer in a little backpack, and closes and locks the door, and pins a note to it: Isabella Amariah is gone on important business and may be some time.
And then he teleports to a random city on the same continent.
[Not really. I just know she went somewhere that time works differently and something went wrong. She's going to come back, but it might take - a long time.]