Since I was just talking about this, I'm still reading The Vagrant. The writing is compelling but extremely unorthodox - it's all in the present tense with the majority of the dialogue described rather than being explicit.
The theme though is amazing. The world is post-apocalyptic in a setting invaded by demons who are corrupting everything, bringing about mutation and disease as well as their own contentious politics while the old stagnant regime led by the angelic self-righteous Seven is crumbling. The story follows the Vagrant, a Seraph Knight who never says a word but is carrying three things of note; an extremely powerful singing sword, a baby, and a goat.
It got really fun once I got past the writing style since it features very strong themes of corruption versus nobility without beating the reader over the head with them. Essentially it's Mad Max meets *<insert Samurai movie here>" in a backdrop of futuristic fantasy.