My goodreads review speaks for the book:
A masterful read. Ms. Martin delves into the human condition deeper here than in any other book I've read. I was nearly brought to tears not only by the sheer emotion evoked, but by the beauty of the prose. The tome brings mental illness into the light in a very true and respectful way. You cannot help but be affected by the words, revealing the truth in the phrases "Don't judge a book by its cover" and "You are one of a kind". Even better on a second read-through, it claims a spot as one of my favorite books.
I recommend this book to everyone. It is a must-read if you love middle-grade.