From the Mixed-Up Files of Mrs. Basil E. Frankweiler Chapter 10 Summary
It's a slumber party kind of affair, since Mrs. Frankweiler keeps the kids up all night telling the story about how they ran away into a tape recorder. She's definitely not going to give up her Angel secret without one of theirs in return.
Mrs. Kinkaid calls Mrs. Frankweiler's home in a panic because Saxonberg has told her that they're there. Hmmm… how does Saxonberg know Mrs. Kinkaid anyway?
Mrs. Frankweiler though, is adamant. She will not send the kids back until she's heard their story. They are perfectly safe where they are and she will send them back first thing in the morning with the chauffeur.
The next morning, Claudia and Jamie depart in style—driven in a Rolls Royce by the chauffeur, Sheldon.
On the ride back to Greenwich, the siblings discuss the angel and why Mrs. Frankweiler would ever auction it off for such a low price. That just seems like bad business.
Claudia explains to Jamie that Mrs. Frankweiler probably did it for the excitement. She doesn't really need the money, after all, and at her age it's probably more fun to watch people try to figure things out when she knows the truth.
Jamie says that they should visit Mrs. Frankweiler whenever they save up enough money, which they'll have to start doing all over again. They can take her on as a sort of grandmother, since they don't have one.
Mrs. Frankweiler addresses Saxonberg directly now, concluding this very, very long letter that explains to him why she is leaving the sketch to Claudia and Jamie in her will. You'd think she'd be able to fit it all in fewer than 100 pages, but nope…
And then she reveals something else: Saxonberg is, in fact, Claudia and Jamie's grandfather. (Gasp!) We bet you didn't see that coming (or maybe you're really smart and you totally did).
She ends by saying that museum officials recently found a trumpet case and a violin case hidden in the museum and filled with children's laundry. They have no idea where it came from. We do—but we're going to keep it a secret.