This really is a fun, fast-paced, exciting read with fascinating characters. I'm inclined to agree with Mosca's statement that I'd prefer more story to a happy ending, and I'm really hoping the author writes a sequel.
It's fantastic! The humor is excellent, the wit is scorchingly bright, and the book keeps you turning pages like a geas. Mosca caught my eye because of Volpone's Mosca, and Mosca Mye is a perfect heir to that heritage... Marvelous, marvelous book!
I too want a sequel. Heck, anything more by Frances Hardinge would suit.