Book 3 The Siege of Terra by Gav Thorpe
It’s Book 3 and of course the reigns had to be passed to Gav Thorpe at some point. A safe, dependably write who seems to really care for the Warhammer 30k story line… and produces cracking books as well.

From the book:
The war for the fate of mankind blazes on. Though the outer defences have fallen, the walls of the Palace itself remain inviolate as Rogal Dorn, the Praetorian of Terra himself, uses every known stratagem and ploy to keep Horus’s vast armies at bay. In Perturabo, the Traitor siegebreaker, Dorn faces an adversary worthy of his skill. A terrible, grinding attrition ensues. The crucial battle for the Lion’s Gate space port is at the heart of this conflict. With it in their possession, the Traitors can land their most devastating weapons on Terran soil. Dorn knows it must not fall. But with enemies attacking from all sides, and the stirrings of the Neverborn drawn to the slaughter, can the Imperial defenders possibly prevail?
Gav Thorpe brings characters from Terra and Terra orbit together from Imperial Guardsmen, Rememberancers, Traitors and Primarchs… and knits it all together in a satisfying progression of the story… as the Space Port comes under attack from Perturabo.
Not every novel can include Sanguinius and his Blood Angels, and so this one brings in the battle of the greatest strategists within the Primarchs together in the first for the Lion’s Gate space port. As with other books in the series, Gav Thorpe ensures that he includes ‘normal’ citizen in the form of Imperial Guardsmen and Rememberancers to give us – the simple reader – a change of understanding the super-human conflict which is raging on Terra. And he does a good job of it too.
There are times when the battles stall a little, but it is barely noticable as you quickly dive into another ‘set-piece’ battle as part of the conflict. It’s another great addition to the end of the story!
— Declan
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