Patrick Ness 
Monsters of Men 

"War, " says the Mayor. "At last."Three armies march on New Prentisstown, each one intent on destroying the others.Todd and Viola are caught in the middle, with no chance of escape.As the battles commence, how can they hope to stop the fighting? How can there ever be peace when they’re so hopelessly outnumbered? And if war makes monsters of men, what terrible choices await?But then a third voice breaks into the battle, one bent on revenge…The electrifying finale to the award-winning Chaos Walking trilogy, Monsters of Men is a heart-stopping novel about power, survival, and the devastating realities of war.