I finished reading A Wrinkle In Time to Katie and Julie a few days ago. Having ascertained that there were more books in the series, I asked Gretchen if she had the next book. She concluded that she didn't.
So the entire series will be here in a lovely (and inexpensive) boxed set on Sunday. And chapter 1 of A Wind In the Door has been downloaded to my phone, so I can probably fake my way through it until then by splitting that chapter in two.
Apparently, the Internet is for shopping.