Themes are more mature than first 2 books in series
My 10 year old daughter and myself read the classic, A Wrinkle In Time and also read A Wind In The Door and greatly enjoyed both.
The 3rd book, A Swiftly Tilting Planet, however is much more complex in its storyline. In addition, there is a very mature part where a stepfather is physically abusing his wife. It also details the stepfather making sexual advances toward his stepdaughter.
These are topics I do not feel should be discussed with a 9 or 10 year old.
I rated this book at 11+ as a result.
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