Don't understand the positive reviews.
The characters are very one-dimensional, Lydia is the only half-engaging character, the rest are comically flat.
It does not offer any more insights into the world of THT except for how to become an aunt.
The ending is contrived and feels very detached from 80% of the book, which mostly goes nowhere.
I know M.A. can do better than this, I suspect this once was a quick cash-cow