Black Templars Chaplain Grimaldus leads the defence of Hive Helsreach, a city in the path of a massive greenskin force on the war-wracked world of Armageddon. Battle rages and the Black Templars win several vital battles, but as the ork numbers grow and the Imperial defenders dwindle, Grimaldus and his loyal Sword Brethren are forced into a desperate last stand that will test the Chaplain’s resolve and leadership to their limits.

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It's a losing battle to save a city from a never-ending tide of orks, but the Black Templars refuse to give in, no matter the odds. And Chaplain Grimaldus proves why he's right for the job by inspiring everyone around him human and Space Marine to the point where they might just win the impossible war.