I have been waiting for this book for a long time. Over a decade, to be exact. When I was in grade school, I was obsessed with unicorns. My best friend at the time shared this passion, and we were always sharing unicorn themed books and playing make-believe unicorn games. There’s a surprising lack of unicorn-related books in the book world, and one of our favorites was The Unicorn Chronicles, by Bruce Coville. We read the first two fairly quickly (review here), and then prepared to wait for the third installment. It never came. I distinctly remember asking about it every time I went to Barnes and Noble. But eventually, I grew up and…