I'd be worried if you didn't have a few niggles, Brian. There are always things that niggle me in every book - especially if I've written it! I've had to read aloud from it a lot over the last couple of weeks - in having done so, I can certainly see weaknesses that I wish I'd spotted before. However, taking all into account I am pleased with Imperial Spy. I see it as having taken a big step forward from my earlier work, and I can now look to build on that further with Imperial Assassin.
Thanks for your kind words.