The planet of Theotokos is dying. Drought has wiped out all but the capital city of Magerit. Worse, an outbreak of a terrible plague, known as the Grey Tears, ravages its populace. Only the charismatic Arch-Deacon Ambrose stands in the way of desperation and anarchy. But as the plague rampages through the streets, murdering its victims with unnatural symptoms, Ambrose struggles to confront the appalling measures he must take to save his people.