Please help me with my book?

Well, the plot is very developed and you can definitely do a lot with it. You also have your dialogue down pat. I just suggest working a little more on character description and scenery. That way your reader will feel more familiar with the story, rather than at a loss for what everything is supposed to look and feel like. Other than that, it sounds like a really good story! Keep working on it; it sounds like you can go pretty far with it. Good luck!