Events turn as Gaunt is summoned to Balhaut's Commissariat headquarters. A senior officer of the arch-enemy has been captured, and refuses to speak to anyone but Gaunt. The Inquisition is attempting to secure custody of the prisoner so that they may handle him their own way. The prisoner insists that he wishes to help the Imperium, but this claim is met with speculation by Gaunt. However, he is forced to protect the prisoner and go to ground in the city when a Blood Pact insertion team storms the facility in an attempt to silence the prisoner. With heretical witchcraft influencing the populace and a determined hunter pursuing them, who can Gaunt turn to for aid? And what information does the traitor general know that prompts the enemy to openly assault an Imperial stronghold?