I have read what you have posted up so far on your book and here is what I think (I'm not lying this is my actual opinion of your story):
Interest: Your book was really interesting I enjoyed reading it.
Grammar: You forgot to use the space bar a few times, there were words that should've been other words to make the sentence correct (etc. was and were) and there were a few times when the speech should've been on different lines but apart from that your grammar was fantastic.
Overall: It was very good and I think that if I can, I might come back when you have written more and read your new bits in the story.
Rating out of ten: 9