In a galaxy teeming with alien aggressors, nothing unites the Imperium more than the worship of the immortal God-Emperor. Without the shining light of his divinity, travel through the stars would not be possible, and humanity would be swallowed by darkness. The shrineworld of Vadok attracts billions of pilgrims who visit to reaffirm their faith, and catch a glimpse of the sacred relic held in its great cathedral. But the reach of man's enemies is long, and when civil unrest breaks out, and rumours of four-armed monsters abound, the Adepta Sororitas tasked with defending the world must face the fight of their lives. For they are few, but their enemies are numberless.