Which Halo novel was written by William C. Dietz?

William C. Dietz wrote the Halo novel The Flood.

The Flood was published in 2003 by Ballantine Books and is a novelization of the events of Halo: Combat Evolved. It follows the human forces and Master Chief during the battle on Installation 04, while expanding on scenes, characters, and perspectives that the game only briefly presents.

The book is notable for shifting beyond the player character’s viewpoint. It includes material involving human soldiers, Covenant forces, and other participants in the conflict, giving readers a broader account of the first game’s campaign. Dietz’s adaptation therefore adds narrative detail while remaining closely connected to the game’s plot.

The Flood is often mixed up with The Fall of Reach, the first published Halo novel, which was written by Eric Nylund. First Strike and Ghosts of Onyx were also written by Nylund, making The Flood’s authorship a useful distinction among the early Halo novels.