Mind. Blown. 
 Sanderson turns from fantasy to sci-fi here and shows that they're really two sides of the same coin. Or maybe it's that superheroes are simply modern day fantasy. Either way his writing style works here just as well as in his other works. 
 The background is that something appeared in the sky 10 years ago, and suddenly people started gaining superpowers, becoming Epics. Unfortunately this also led to their corruption. Now Epics fight each other for the right to rule over groups of normal humans with an iron fist, being laws only unto themselves. A small band of these humans has had enough and wants to fight back. This is their story. 
 All of Sanderson's talent in building backstories and planting clues are here. His penchant for plot twists and heart-wrenching reveals are also fully in place. I knew there would be twists, but didn't expect a couple of these. The in-dialog catalogueing of the reveal was done cleverly when compared to some YA but also felt like a good-natured taunt from the author to the reader. 
 This is a book for Sanderson fans and can also serve as a great introduction for those who haven't read his other works or don't like the more traditional fantasy settings.