This was a quick and fascinating read into a master Forger and how she attempts to make a masterpiece while captured and yet leave with her life.
Like all of Brandon Sanderson's books, the best part of it is the magic system: Forging. At first you don't have a clear idea behind it, but as the story progresses you learn more and more about it.
The story could have been a bit longer and things seemed a bit easy for the main character, but it's only a novella so you expect a quick resolution to the conflicts.

A longer review is available at my blog: strakul.blogspot.com/2012/12/novella-review-emperors-soul-by-brandon.html