Saint Sabbat has returned, and she is being hunted by the deadliest of assassins. Gaunt's Ghosts must fight to protect her - but can they defend against treachery from within? It's the culmination of a massive story arc that sees tragedy strike even as the Sabbat Worlds Crusade is given new hope with the reappearance of the Saint herself. Mysticism and warfare collide, with compelling results.

Imperial commissar Ciaphas Cain returns to Nusquam Fundumentibus to crush the ork attacks which have been plaguing the frozen planet. But when his ship crashes into the wastelands outside the capital it disturbs a far greater enemy, one which has lain dormant under the permafrost since long before the Imperium came to this world and could now threaten the whole sector.

The Sabbat War is a savage Imperial crusade, cutting a bloody, burning path across a vast swathe of the Imperium's lost territory. On the front line, the stalwart regiments of the Astra Militarum, including the valiant Tanith First-and-Only—better known as Gaunt’s Ghosts—confront the relentless menace of Chaos, the Archenemy of Mankind. There is, and ever will be, only war.

When the vital forge world of Orestes comes under attack by a legion of Chaos Titans, the planet is forced to appeal for help. The Titans of Legio Invicta, although fresh from combat and in desperate need of refit and repair, respond, committing their own force of war engines to the battle. As the god-machines stride to war, the world trembles, for the devastation they unleash could destroy the very world they have pledged to save.

On the battlefields of Aexe Cardinal, the stalwart forces of the Imperial Guard are locked in a deadly stalemate with the dark armies of Chaos. Colonel-Commissar Ibram Gaunt and his regiment, the Tanith First and Only, are thrown headlong into the living hell of trench warfare, where death by an unseen enemy is always just a moment away. The only chance for Gaunt and his lightly armed scouts to survive is to volunteer for a mission so dangerous that no one else dares accept it.

Pursued by vengeful eldar, Magos Kotov’s Explorator armada heads into a newly revealed area of space in pursuit of ancient secrets. As the Adeptus Mechanicus forces and Black Templars Space Marines tackle the twin threats of the wrathful aliens and insurrection aboard the fleet, a greater danger reveals itself.

The Indomitus Crusade continues its war across the stars. The primarch Roboute Guilliman has finally broken through the orkish threat bedevilling the sectors near Fenris, and makes ready to push on his bid to stabilise the Imperium Sanctus—but old and bitter foes stand in his way. Kor Phaeron, the Dark Cardinal, threatens the previously stable core of the Segmentum Solar. Waves of rebellion instigated by his infiltrating priests suggest an imminent, large-scale invasion by the Word Bearers Legion. 

Gaunt’s Ghosts embark on their most dangerous mission yet as they make a daring drop assault on the world of Phantine. With the elite enemy Blood Pact and vicious xenos mercenaries ranged against them and short of ammunition with no means of escape, things look grim for the Tanith First. But the greatest danger may come from within the regiment as an old grudge is settled and tragedy strikes. 

The Ghosts of the Tanith First-and-Only have been away from the front line for too long. Listless and hungry for action, they are offered a mission that perfectly suits their talents. The objective: the mysterious Salvation's Reach, a remote and impenetrable stronghold concealing secrets that could change the course of the Sabbat Worlds campaign.

The Officio Assassinorum safeguards the future of humanity. Its agents are the bloody-handed, secret saviours of the Imperium, killers charged with achieving the impossible...and Vindicare assassin Absolom Raithe has just been handed the most difficult assignment of his career.

Commissar Cain is called to duty once more, saving a governor's daughter from a planet overrun by rebels. The uprising hides something far more sinister however - genestealer hybrids! The search for the source of the alien threat leads Cain to a drifting space hulk - a far safer place than beside the obsessed governor's daughter. But when the Reclamator Space Marines suffer devastating losses at the hands of the Great Devourer, Cain and his trusty aide Jurgen must go it alone. 

In disgrace after a catastrophic war, Colonel-Commissar Ibram Gaunt and the Tanith First are sent to retrieve precious artefacts from a world lost to Chaos. With enemy all around them and time against them, Gaunt's Ghosts and their allies must prevent the holy relics of Saint Sabbat from falling into their foes' hands, and as mysterious events begin to occur, Gaunt begins to suspect that the Saint herself might be aiding them from beyond the grave. 

Quillon Drask is a haunted man, wrestling with the daemons of his past. With a reputation that draws only the strangest cases, he is intimately familiar with the malevolent underbelly of Varangantua. Yet nothing that has gone before could have prepared the probator for the horrors which now blight the district of Polaris. Faced with a savage crime with frightening implications, Drask is thrust into a game of corruption and conspiracy, warring families and blasphemous revelations. 

On the world of Verghast, a grinding war between two hive cities - one loyal to the Imperium, the other fallen to the worship of the Dark Gods - is bolstered by the forces of the Astra Militarum, spearheaded by the Colonel-Commissar Gaunt and the Tanith First and Only. But bitter rivalries and treachery threaten to derail the defence of Vervunhive, and it falls to Gaunt to take command of the Imperial forces and forge victory from an almost certain defeat.   

After the success of their desperate mission to Salvation's Reach, Colonel Commissar Gaunt and the Tanith First race to the strategically vital forge world of Urdesh, besieged by the brutal armies of Anarch Sek. However, there may be more at stake than just a planet. The Imperial forces have made an attempt to divide and conquer their enemy, but with Warmaster Macaroth himself commanding the Urdesh campaign, it is possible that the Archenemy assault has a different purpose....