Returning to the crusade's heart after a dangerous mission, Colonel-Commissar Gaunt is thrust into intrigue while his Ghosts face a threat to their very existence.

After the success of their desperate mission to Salvation's Reach, Colonel-Commissar Gaunt and the Tanith First race to the strategically vital forge world of Urdesh, besieged by the brutal armies of Anarch Sek.

However, there may be more at stake than just a planet. The Imperial forces have made an attempt to divide and conquer their enemy, but with Warmaster Macaroth himself commanding the Urdesh campaign, it is possible that the Archenemy assault has a different purpose - to decapitate the Imperial command structure with a single blow.

Has the Warmaster allowed himself to become an unwitting target? And can Gaunt's Ghosts possibly defend him against the assembled killers and war machines of Chaos?