On the capital world of Potence, young enforcer cadet Rudgard Howe is caught up in a bitter internecine feud to inherit his father's position of Chief Enforcer. As the tithe fleets approach, he is sent on his first mission to ensure that the planet's distant agri-facilities fulfil their quotas to the God-Emperor.

Farmed with serfs and managed by ex-Militarum soldiers, the agri-facilities are places of shocking brutality and hopelessness. But when he is sent to the outlying farmstead of Thorsarbour, Rudgard discovers a community where the crops are left to rot as the inhabitants indulge in the bloody ecstasy of a sanguinary cult.

As Rudgard imposes the strict Lex Imperialis upon the farmstead, he begins to uncover a place where sanity is rapidly slipping. But he is just one step along this nightmarish mission when a series of cruel deaths threatens to dismantle everything he has ever known about the Imperium, his faith in the Emperor, and the strength of his very soul.