I enjoyed this book and whipped through it pretty quickly.
I would rate it at about 7.5/10 only because whilst the story and subject matter are interesting and the plot intriguing, the characters are a little hollow for me and at first, because there are so many of them, I found the story a little confusing - it took me a while to be able to picture all the cast of characters and their relationship to each other.
That said, it is an enjoyable read and allows for several hours insight into the world of birds, bird people and bird dealing. Very interesting and easy to read.