[...]

[Okay, she had long ago accepted magic and parallel worlds and all those seemingly incomprehensible mysteries of the universe. But there was still something about what he said that bothered her. She couldn't quite put her finger on it. Not yet.]

It's as if...the letters arrived the same way we all did.

[Different universes. Different points in time from each universe.]

Except...I was told that if we ever went home, we wouldn't remember anything about Keelai.