Beta Readers?

I just finished what I hope is the final edit of my new book, Henry Rider: Clown Hunter (working title). If anyone's at all interested, I'd love to get some opinions on it before I start sending out letters to agents or publishers about it. Here's a link to it on Google Docs: https://docs.google.com/document/d/1zOEXu0tREqKvE8oqJIqqZyeNdgcNkTggB4ULIzjsyXk/edit?usp=sharing