They perform some more magic tests and run out of mana and recover mana and perform more tests and a second sleepover could be fun but it's decided that people can do coordinated tests in their own places and there is not actually a need for them to all be in the same place. The Maxwells' driver takes Jess home (and Maya, too, if she prefers that to staying with the Maxwells but they assure her she's welcome to stay there), then takes Sadde, Theo, and Tyler to the Farron residence, where Sadde prefers to be dropped—he'll go to his place by public transportation, he'd like to talk to the—twins?—yes, thank you, it was a pleasure meeting you.
"… Do you have a blob idea of where I am or does it give you an idea of where my arms and – such are?"
"Nnnneither, I just. Know where you are." Pause. "Okay I no longer know where you are. In any. Supernatural ways."
"So we could cast that a few times, probably, have an idea of where he is? – Does it give direction, idea of surroundings, that sort of thing?"
"We could triangulate, roughly, maybe – quantifying distance is hard – but then we might have a country and if it's Britain we could possibly narrow down to a county, go there sometime after our exams and find him?"
"Or he might be nearer-by and we could visit someday like tomorrow, or we could alter the spell so it works on a map."
"Right, but if we can find cards at all, and then if we can find unsummoned-but-active cards, and then if we can find inactive cards, we might as well test because that could be useful? Avert catastrophe and all?"