off the top of my head the only flaw in the storyline in imperial spy was ....
SPOILER
How did Lord Danar meet up with Reynik to dress up as priests to bust her out of prison? I didnt realise that you wanted critics of Imperial spy seing as it is already out!
I could probably spot a couple of other inconsistencies if i read it through again but as i remember the story flowed quite well
SPOILER
Possibly that a spy, even a highly skilled one, could stand up to the greatest assassin in hand to hand combat, even for a while was quite dubious....mabe a showdown between reynik and shalidar would have been more believeable
Hope this helps