The Wind Singer (Yan Shin)

The Wind Singer by William Nicholson.

Here is a short summary:

Kestrel is a really special girl who hates the rules in Aramanth and the way of people lived. She climbed the wooden tower also knowsn as the wind singer and brings the Chief against her family. What worst is, her father is taken, so now Kestrel and her brother , Bowman, can save him. It was a really hard quest they had and they gone through many problems when they travel a long way... They must find the voice of the wind singer and save Aramanth and their father from evil...

I think it's an adventurous story, interesting fantasy characters but because of the long chapters and story, it becomes a little bit boring...