Just finished the latest book in the Red Rising series by Pierce Brown, so good. Definitely recommend.
Red Rising is a futuristic dystopian series set in a world where society is divided up into various Colors. Each Color has a particular job that they contribute to society, and the Colors also create a very strict social hierarchy. The Red Rising series follows Darrow, a member of the Reds, the lowest ranked Color. The Reds lived below the surface of Mars and they mine energy for the rest of the society. The Reds have always been told that they must stay underground because humans have made the surface completely uninhabitable. However, Darrow (and the reader) finds out that the situation is much more complicated than that. After suffering tragedy at the hands of the tyrannical government running their society, Darrow decides to infiltrate the highest levels of society, the Golds, and dismantle it from the inside out.