Audrey has linked her arm with Maisy's, or tried, anyway, because she can't do a Patronus, either. All she can do is blink in awe at the aftermath of one, and it's beautiful. But they aren't down here for beauty. And Audrey remembers something. "When I was here...Halloween. There was a charcoal rubbing of the glyph. I took it. Mr. Stirling..I asked him about it. He said it was complicated. Part of something bigger. Locking charms...and an atmospheric charm."

It really hadn't occurred to her, before, to make this very public knowledge. It had felt like a dead end before. But now, it's...maybe something. Pieces are falling into place.

"And I think...is the plan just. To walk in?"