After a long and distinguished career defending the Imperium from its many enemies, Commissar Cain is enjoying a well-deserved retirement on Perlia, teaching in a schola progenium. But when a Black Crusade threatens the sector, all able-bodied citizens must rise to the defence, including Cain and his cadets. As the forces of Chaos overwhelm Perlia, can the wily commissar prove himself to be a real hero of the Imperium one last time?

War rages in the Caradryad Sector. Worlds are falling to madness and rebellion, and the great war machine of the Imperium is moving to counter the threat. Amongst its agents is Inquisitor Covenant. Puritan, psyker, expert swordsman, he reserves an especial hatred for those of his order who would seek to harness the power of Ruin as a weapon. Summoned to an inquisitorial conclave, Covenant believes he has uncovered such a misguided agent and prepares to denounce the heretic Talicto before his fellows.

The galaxy is divided, but while his armies prepare for battle, the Emperor himself remains curiously absent. In his place stands Malcador - legendary Sigillite, First Lord of Terra and regent to the throne - now arguably the single most powerful man in the Imperium. Army officer Khalid Hassan reports back to the Palace after a disastrous secret mission into the wastelands of Gyptus but soon learns an awful truth about the destiny of mankind. Where do Malcador's true loyalties lie?

When a mysterious messenger contacts the Adepta Sororitas, Celestian Miriya must travel to Hollos and pass judgment on the world. Will she find a world embracing the Emperor's truth or one in need of cleansing? Her decision will liberate or condemn an entire planet.

It is the 32nd millennium, and the Imperium is at peace. The Traitor Legions of Chaos are but a distant memory, and the many alien races that have long plagued mankind are held in check by the Space Marines. When a mission to exterminate one such xenos breed on the world of Ardamantua draws in more of their forces, the Imperial Fists abandon the walls of Terra for the first time in more than a thousand years.

Across the war-torn galaxy, the Imperial Guard are a bastion against the enemies of mankind. From the elite veteran drop troops of Elysia to the fierce Catachan jungle fighters and from Valhalla's ice warriors to the crews of mighty battle tanks, the many regiments of the Astra Militarum defend the Emperor's realm against all who would tear it asunder. This audio drama anthology contains seven tales of the brave soldiers of the Astra Militarum. A three-part story delves into intrigue surrounding Sergeant Zachariah of Elysia as he faces traitors. 

For a thousand years, the Sabbat Worlds have been lost to the Imperium, claimed by the dread powers of Chaos. Now, a mighty crusade seeks to return the sector to Imperial rule. And at the forefront of that crusade are Colonel-Commissar Ibram Gaunt and the Tanith First and Only - better known as Gaunt’s Ghosts. Trapped in the grinding trench warfare of Fortis Binary, the Ghosts find themselves drawn into a conspiracy to assassinate the crusade’s leader, Warmaster Macaroth.

Holy warbringer of the Legio Metalica, the Imperator Titan Casus Belli has routed armies and levelled cities over 10,000 years of service in the name of the Machine God. As war engulfs the Dark Imperium, this mechanical god of battle arrives to destroy the renegade armies and tech-priests of Nicomedua. At the head of a battlegroup of Titans, Imperial Knights and skitarii, Casus Belli must defeat tainted war engines, Traitor Legionnares and armies of cultists.

Plying the stars and forgotten backwaters of the Imperium, Rogue Trader Captain Athene Santiago and her eclectic crew are chasing pirates when their quarry inexplicably vanishes, only to return a moment later. Unwilling to let her bounty go unclaimed, Santiago ventures aboard the now stricken vessel, but what she finds defies reason and leads to a discovery of something ancient and terrifying that could threaten not only her crew and her ship but the entire sector.

Cadia, 10,000 years a stalwart bastion against Chaos, is broken. Its collapse at the hands of Abaddon and the Thirteenth Black Crusade has fractured the Imperium of Man, and in its wake spreads the seeds of heresy, lies and insurrection. It falls to Cadia’s survivors to fight on, bloodied but unyielding, in the name of the Emperor. On the world of Malouri, traitorous forces have retreated to the impregnable island fortress of Crannog Mons.

On the war-torn world of Croatoas, the armies of the Astra Militarum do battle with the twisted servants of the Ruinous Powers. Against the backdrop of this increasingly desperate conflict, tanker Hadeya Etsul finds herself consolidated into a Cadian regiment, and placed in command of the Leman Russ Demolisher Steel Tread. Haunted by nightmares, surrounded by a dysfunctional crew and striving to find her place amidst a proud and insular regiment with a culture so different from her own, Etsul must guide her crew to victory. 

For nearly 10 millennia, the Crimson Fists waged war against the enemies of mankind from their home planet of Rynn's World. And then, in one cataclysmic event, Rynn's World fell, despoiled by the hordes of the orks. Six months later, Chapter Master Pedro Kantor leads the shattered remnants of his Space Marines in pursuit of a force of greenskins still clinging to life in the mountains of the devastated world.

The skitarii are the soldiers of the Machine God, the tireless legions of the Adeptus Mechanicus. Holy warriors, they carry the word of the Omnissiah across the galaxy, destroying impure machines and spearheading the Quest for Knowledge. A discovery of ancient technology sends a skitarii legion into battle on a forge world overrun by Chaos. When a cataclysm cuts him off from his tech-priest overseers, Stroika must rally his forces and battle both corrupt machines and Chaos Space Marines.

In the skies above Armageddon, the Black Templars prepare for war, and the Ancients are awakened. Brother Adelard, interred in the Dreadnought Invictus Potens, leads his brothers to war, facing the prospect of a second death in service to the God-Emperor.

Exile to the miserable world of Sedh, the disgraced Necron Lord Oltyx is consumed with bitterness. Once heir to the throne of a dynasty, he now commands nothing but a dwindling garrison of warriors, in a never-ending struggle against Ork invaders. Oltyx can think of nothing but the prospect of vengeance against his betrayers, and the reclamation of his birthright. But the Orks are merely the harbingers of a truly unstoppable force. Unless Oltyx acts to save his dynasty, revenge will win him only ashes.