Arthur wrote: By the beginning of the third book one could already see there are too many sub-plots to be resolved in only one book. The fate of the English empire and the commoner revolution, Kitty's antempt to change history, Nate's relationship with Kitty, the Mandrake versus Nathaniel issue, the development of the character Jakob, the enslavement of the spirits and their resistance and Bart's relationship with Nate were some of those that haven't been well resolved. And OK, there is always the possibility to end a book without explaining everything, but that's usually done for some reason; in the case of the Bartimaeus Trilogy, it just seems like there were not enough time to solve everything. That left me a little frustrated in the end of the third book.
I like the way you think.
In a way, many of the subplots you listed were solved.
Kitty
did change history, mainly by traveling to the Other Place on speaking with Bartimaeus on even terms, but her quest "to change the world," as you put it, worked.
She was part of all of this, and she was the one that took control of the remaining magicians and sent them on their errands while Nat was off fighting. She was the one that initially dealt with the commoners and such, though after a couple days, I'd've handed it off, too.
On the Mandrake v. Nathaniel issue, I think the landmark moment in that inner struggle was when Nathaniel tells Kitty to call him by his true name, signifying he accepts who he is, and that the struggle has ended.
On the Enslavement of spirits, I never saw a subplot there, just Ptolemy's attempts. If you wanted to, one could say Kitty's little adventure ended the subplot as well.
The relationship between Nat and Bart was resolved with that last paragraph.
Anything not resolved or not resolved completely Stroud did on purpose, letting our imaginations finish the story, as Nero said.
Stroud set up everythng, laying a foundation, in AoS, built upon that in GE, the "frame" of the building, then finished everything nicely with PG.
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