Warhammer 40k Emperors Legion Prose Novel

"The Emperor's most trusted guardians fight beside his elite witch-hunters to defend the Golden Throne. The Custodian Guard have stood watch over the Emperor's Palace on Terra since the foundation of the Imperium. Charged with protecting the Master of Mankind from all threats, their fearsome resolve is renowned throughout the galaxy, and their golden armour is the last thing that a would-be assassin or saboteur will ever see. Alongside the Null-maidens of the Sisters of Silence, who are anathema to psykers and sorcerers alike, there is no threat to the Golden Throne that they alone cannot vanquish... until now. "