This is one of the better stories in a GREAT series. It is also one that does best as stand alone book, but is always richer when taken as a whole series. The world building is so complex, subtle, society and character based, the complexities of manners and protocol so developed, that every page is gripping, intelligent and intriguing. This is sci-fi at its best.
This is the tale of a mathematician, a mouse, what might have been a bullied wreck but for inner strength. It is a tale of triumph over adversity, justice, qualities (the good and the bad) hidden behind facades and yet dug up and recognised. The joy of the plots premise reaching its full potential in the end is a triumph! I couldn't put the book down, or stop thinking about it afterwards. It is not one of the complex space opera, spying, battling or technology books, it is much more and much richer than that: it is people first and tech as a product of or tool for their own hard earned work and skills.
I won't put in any plot spoilers, it's too good a book to want to take that away from any reader, besides you can get that elsewhere... can't recomend this highly enough. On my shelf in hard back. So glad its on Kindle too now.