We’ve always sought to write about the deepest conflict possible in our stories. The idea of mankind having to coexist with extra-terrestrial beings provided ultimate conflict. It was Brittany who thought of the initial premise for Hatred Day, but the story grew and changed as we did over time—9 years to be exact. Before publication in January 2016, it progressed through several titles and dozens of rewrites. Only two or three original story beats exist in the published novel.