I am surprised at the reviews below. I think this book is exactly what it makes out to be. A historical adventure novel. There is great attention to detail and yet it is still easy to read. I agree that the characters are a bit shallow, but for me this story was about the adventure, not the protagonists. Some of my most favourite, and developed characters didnt seem to last too long, and that is a shame but overall, I found myself turning the pages eager to get to the next part of the story.
In short: If you love that in-depth character of Dosteyevsky et al. This is not a book for you. HOWEVER, if you just want a bit of a historical whimsical adventure, then buy it, read it, and enjoy the story.