In the fourth episode of "The Witch and the Beast," the focus is on necromancy, an art that allows practitioners to resurrect corpses as undead. Against this backdrop, a series of disturbing events unfolds in the city, where an increasing number of undead lose control, spreading chaos and fear among the population.

The episode begins with Ashaf and Guideau helping a grateful woman, shortly before encountering an undead creature wreaking havoc in the streets. This incident highlights the growing undead problem and prompts Ashaf to call for assistance from specialists within the Order.

Phanora, a blonde necromancer, and Johan, her one-eyed servant, are tasked with dealing with the undead. They meet police officer Jeff Enker, who provides them with insight into the situation: numerous rampages by undead, all linked to illegal resurrections where standard procedures were bypassed.

Phanora suspects that the undead might be "strays"—revived and abandoned without her knowledge. This leads to a city-wide operation led by Ashaf to track down all undead and the necromancers associated with them, aiming to contain the chaos.

The specialists and Officer Enker discover that the city harbors four necromancers and 21 undead, a surprising revelation given the taboo surrounding necromancy. As they devise their strategy, Phanora uses a lantern that lures the undead with a light only they can perceive, leading to a chilling encounter with a horde of undead.

Phanora explains the three stages of undead autonomy, shedding light on the varying degrees of control a necromancer can exert over the resurrected. This explanation serves as a key exploration of the limits of necromancy in this episode.

The episode reaches its climax as the group follows clues to a mansion, where they confront a terrifying undead creature and the necromancer responsible for the recent disturbances.