The Founding — Dan Abnett

This omnibus edition of the first three Gaunt's Ghosts novels follows the story of the Tanith First-and-Only regiment (nicknamed the Ghosts) and their charismatic commissar, Ibram Gaunt. As they travel from warzone to warzone in the Chaos-infested Sabbat Worlds system, the Ghosts must not only carry out the most dangerous of missions but also survive the deady politics of the Imperial Guard.