OK, this is *not* Jane Austen. I read the book, and I don't recognize much of it here. The main romance bobs up and down like a yo-yo, unlike the standard Austen story arc. The characters and manners are (mostly) there, but, overall, it lacks the real Austen feel.
I strongly suspect that, making a series of it, the producers felt they could string it out to a second season, and just haven't admitted that yet.
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Sanditon. [Season 1]