I have to say this is probably my favorite book out of the series so far (and probably including the Song of the Lioness series). Here is my review of Emperor Mage by Tamora Pierce.
What I really like about this story is the political intrigue. We have gotten to know the enemies, but this story starts with an attempt to make peace. So while we are watching the characters we have gotten to know try and play nice, we also get a glimpse into a more complicated living situation in the foreign land.
We also get more information about Daine’s past which is a nice answer to one of the bigger mysteries of the series. Overall it’s a pretty interesting story that is one of the stronger ones by Tamora Pierce I’ve read. I give it four out of five stars.