The Visitor is the primary antagonist of the novel, a malevolent and shapeshifting supernatural entity confined to the Carnswel property. It is a parasitic force that derives its power from the psychological vulnerabilities of its victims, particularly their unresolved grief and trauma. Its methods are based on insidious psychological torment, using memories and deep-seated fears to weaken and manipulate the caretaker.

The entity’s defining physical characteristic across its various human forms is its “cold blue eyes, so pale they [a]re almost white” (xix), a consistent marker that betrays its inhuman nature and separates it from the loved ones it impersonates. It’s a static entity in its goal, which is to cause misery to manipulate the caretaker, but it’s round in its multifaceted and adaptive methods of attack.

The Visitor’s most potent tactic is its ability to assume the form of deceased or beloved individuals. For David, it manifests as his son, Caleb, exploiting David’s guilt over Caleb’s death. For Macy, it takes the form of her father and her sister, Jemma. In these forms, it speaks with intimate knowledge of its victim’s past, revealing secrets and weaponizing insecurities to sow psychological chaos. For instance, it tells David, “Caleb blamed you too, David. He left this world hating you more than he hated himself” (xxiii). It later torments Macy with details of her suicide attempt, demonstrating an omniscient and deeply personal cruelty. This strategy aligns directly with the theme of Grief as Ritual, showing how the entity’s power is directly proportional to the unaddressed pain of the characters. By forcing its victims to confront their deepest sorrows in the most horrific manner, the Visitor turns the process of grieving into a source of terror, corrupting memory and affection into instruments of torture.

David functions as a posthumous mentor whose actions establish the entire framework of the narrative. When the story begins, David is already deeply enmeshed in the struggle against the entity, having established the meticulous and strange set of rules known as the Rites. These rituals, which include managing lights during the “witching hour” and dealing with rabbits, are his desperate attempt to create order and control in the face of an incomprehensible evil. His creed that “[n]ames gave malevolent things a shape, gave them a place in his mind to settle” reveals his methodical approach to managing fear (xv), treating the supernatural threat as a problem that can be managed through procedure and vigilance.

David’s backstory reveals that his battle is rooted in personal tragedy. The Prologue depicts his encounter with a Visitor that has taken the form of his deceased son, Caleb. This encounter exposes the source of David’s torment and his motivation for maintaining the Rites: He is driven by a profound and unresolved grief, which the entity exploits. His character is presented with ambiguity, however; Grace describes him as suffering from dementia and hallucinations, which casts doubt on the legitimacy of his rules and forces both Macy and the reader to question whether the threat is real or the product of his mind. This uncertainty makes the eventual confirmation of the threat all the more terrifying. Through his VHS tape recording, David provides Macy with the exposition and warnings necessary for her survival, guiding her from beyond the grave and positioning her as his successor in the endless, burdensome task of being the caretaker.

Jemma is Macy’s 17-year-old sister. She serves as a crucial foil and the story’s primary voice of reason. A round and static character, her personality is defined by a pragmatic cynicism, sharp wit, and fierce loyalty to Macy. Throughout the novel, Jemma remains grounded in reality, consistently questioning the bizarre and dangerous job her sister has taken. Her immediate reaction to the VHS tape is to declare the situation a trap, urging Macy, “Send the money back […] And NEVER talk to these people again” (55). This sensible opposition highlights Macy’s own desperation, as she is forced to ignore Jemma’s warnings out of financial necessity. Jemma represents the ordinary world that Macy is forced to leave behind as she becomes more deeply entangled in the supernatural rules of the Carnswel property.

Beyond her role as a foil, Jemma is the emotional core of the story for Macy. Macy’s deepest motivation is to provide for and protect Jemma, a responsibility that the entity recognizes and exploits as Macy’s greatest vulnerability. The Visitor’s most vicious psychological attacks involve impersonating Jemma or threatening her well-being, tactics that nearly break Macy’s resolve. Jemma’s rebellious streak, exemplified by her shoplifting habit, which she justifies as “balancing the scales” (41) against corporate greed, provides a stark contrast to Macy’s increasingly dutiful and fearful adherence to the Rites. While Macy is forced to operate within a rigid, terrifying system, Jemma’s actions, though misguided, represent a form of agency and defiance that Macy can no longer afford. Ultimately, Jemma is Macy’s anchor, and the fight to keep her safe is what drives Macy to endure the horrors of the house.

Grace is the catalyst for the novel’s events, functioning as the herald who calls Macy to her ordeal, though her motives remain ambiguous throughout the novel. Portraying herself as a poised, down-to-earth widow, she lures Macy to the isolated property with a deceptive Craigslist ad for a caretaker for her elderly husband, only to reveal that he has been dead for three months. This initial deception immediately establishes her as an unreliable figure. Grace consistently dismisses her late husband David’s elaborate Rites as “superstitious nonsense” and the product of an “unwell mind,” creating the central tension of the story’s first act: Either the threat is supernatural or imagined in nature.

Despite her claims of disbelief, Grace’s actions suggest a deeper fear or obligation. She is willing to pay an exorbitant sum of $9,000 to ensure that the Rites are followed for a single weekend, and she adheres to David’s strict rules about secrecy. This contradiction implies that she either believes in the entity more than she admits or is, at the very least, terrified of the consequences of breaking the deathbed promise she made to her husband. By hiring a desperate stranger and immediately leaving for Florida, she effectively passes on a terrible burden, abandoning Macy to face the entity alone. Her character, though appearing infrequently, is pivotal in setting the trap that ensnares Macy, making her a flat character whose actions have round, far-reaching consequences.