I read this book 10 years ago two or three times when I was a child and it really impressed me.
Although I didn't read it in english and can't comment on the translation, I would highly recommend this book to everyone at any age, but especially to those between the ages of 11 and 14. This is a book you want to grow up with.
Even though I have not thought about this story for a long time and I can not remember the details, what I recall is the feeling this book is able to create. It is a quiet book and it is a very strong book. You feel with the protagonist at every single moment. You can grow up reading this book, I sure felt more grown up after reading it.
I have read many books so far but I only read a handful other books, that were able to create a similar strong feeling. I am very sorry that I fail to describe this feeling in better words, you might just have to find out yourselves.