'Ghosts of Onyx' is the end of one chapter in the 'Halo' saga - and hopefully the start of an entirely new one!
I know a lot more about the 'Halo' universe than the fans do.
Tension is the cornerstone of any good story.
I don't look at it as writing a book in a videogame universe. I look at it as writing for 'Halo', which for me, transcends being just a great video game. It's evolving into a whole new mythology.