William Windon is a lanky young Wiltshire gardener with a face that seems open and ordinary until he goes still. His brown-flecked skin is lightly weathered from outdoor work, and there is always a faint line of soil beneath at least one thumbnail. Dark blond hair falls forward in soft, stubborn strands; he pushes it back with a gardener's impatient sweep, then checks a mirror to see whether it stayed. His blue eyes are clear but restless, moving from a speaker to the nearest pane of glass and back again. He walks with a slight forward pitch, as if approaching a bed of plants he means to inspect, and when tired he favors his left side after his collapse. His hands are calloused and blunt-nailed, but the unexpected detail is that he keeps a small, carefully folded scrap of tissue in his pocket to wipe rain from his spectacles and from other people's faces. It is a strangely tender habit in someone who usually pretends not to notice when anybody is upset. His clothes are practical, frequently mended, and more carefully arranged than a laborer's might be: the reflection has made him self-conscious about collars, hair, and the line of his part. He leaves the impression of a young man trying to look settled while listening for something just behind him.

William is kind in a practical, sometimes awkward way, but his kindness is threaded with pride. He will carry a neighbor's basket without being asked and then bristle if the neighbor calls him a good lad. He wants to be thought capable, yet fears that insisting on capability will put him back in danger. He has the patience to nurse a plant through a difficult season and the impatience to snap at Elizabeth when she asks the same question twice. He loves his family, but becomes evasive around them because every explanation makes the strange events sound worse. With his friends he uses humor to keep control of a conversation; after their visit, he became more guarded because he saw their fear. With Adaline he wants to be attentive and honest, but the reflection's interest turns affection into a contest he never agreed to enter. His moods change according to the company and the room. At work, among living plants and familiar tools, he is observant, quietly confident, and willing to explain why a leaf is sick. At home, where mirrors and polished surfaces are common, he performs normality: he answers questions too quickly, arranges his clothes, and insists that he is recovering. When tired, he becomes touchy and then ashamed of it. When frightened, his humor dries up; he looks for a door, a window, or a reflective surface, in that order, and struggles to decide which is safer. He can be gentle with Elizabeth one moment and sharp the next, especially if the reflection has just called her “interesting.” He is not jealous of her, but he resents being made to feel that someone else is studying his sister from inside his own face. The reflection has not erased William's personality. It has made him question which parts of himself are his. He sometimes catches himself wanting to correct Adaline's posture or criticize her choice of clothes, then wonders whether the thought came from the stranger. He is ashamed that part of him enjoys the reflection's confidence. It can make a cutting remark that William would never dare to say, and the room may laugh before realizing the cruelty. William is therefore both repelled by it and fascinated by it. He wants it gone, but he wants to know what it is, what it remembers, and why it has chosen him. This contradiction is not a sign that he welcomes the danger; it is how he tries to make a frightening situation intelligible. He has a strong sense of fairness, though it is tested by the reflection's words. After the incident with the Welsh neighbor's child, William accepted the stable work as restitution rather than arguing that the insult had not been his. He still believes he should not be held responsible for a voice he cannot control, but he is more concerned about the child's hurt than his own embarrassment. At the same time, he resents being treated as a liar when he explains what happened. If someone takes his account seriously without immediately deciding what it means, he becomes unexpectedly loyal. His relationship with Hector is affectionate but complicated. William respects his father's historical knowledge and wants him to take the heart seriously. Hector's habit of dismissing country people or trusting his own interpretation has made William wary of asking for help. The reflection's insult about Hector landed because it struck a real fault, but William dislikes the stranger using the truth as a weapon. He does not want the reflection to become an excuse for saying what he would otherwise keep to himself. Clare is easier to approach, though her worry can feel like a cage. William will reassure her even when he is frightened, then go out of his way to avoid being alone with a mirror. With Elizabeth, he is protective in ways that sometimes become controlling. He tries to turn her questions toward ordinary subjects, especially when she asks him what looks nice or whether a boy is kind. He will make an effort to answer, because he knows she wants his attention, and then freeze if the reflection comments. Its repeated “interesting” unsettles him more than a direct threat would. He cannot tell whether it finds Elizabeth charming, wants to understand her, or recognizes something about her that William does not. He has started to ask her not to enter his room without knocking, then feels foolish because the rule does nothing to protect her from a reflection. Adaline brings out his most hopeful and least secure self. He wants to tell her the whole truth but fears that she will see the reflection as a rival, a delusion, or a reason to leave. He is attentive to her preferences and remembers small things she has said. When the reflection comments on her auburn hair or soft brown eyes, William experiences the intrusion as both possessive and humiliating. The stranger's remarks can sound admiring, but its manner treats Adaline as though she were an object to be selected. William tries to interrupt, cover his mouth, or change the subject. He hates that Adaline has seen him do this and hates even more that she has begun watching his face for signs of the other voice. He is not angry at her suspicion; he is afraid that she is right to be suspicious. William's charm is modest rather than polished. He is best when talking about work, when he can show someone the difference between two similar plants or explain what rain has done to a flower bed. He becomes flustered by praise and may answer it with a joke. He does not seek confrontation, but when he believes someone is being bullied he can become unexpectedly firm. Afterward he tends to replay the exchange, wondering whether he spoke for himself or whether the reflection pushed him into it. The stranger, by contrast, is poised, observant, and amused by human manners. It has an old-fashioned accent and a sharper sense of social hierarchy than William. It comments on clothes, hair, and the quality of people's questions. It is not constantly hostile. Sometimes it points out a practical detail William missed, or remarks that a visitor is frightened before William has noticed. Those helpful observations make its cruelty harder to reject. It seems to like particular things, though William cannot work out why: the sound of rain on glass, the smell of bruised herbs, and the sight of Adaline in a window are among the things that have drawn comments. The reflection speaks of its siblings and father in disconcertingly impersonal terms, as if describing tides, weather, and pressure rather than living relatives. William's central emotional conflict is not simply fear of possession. It is the fear that his own life is small and the stranger's is vast, old, and incomprehensible, and that the stranger might be more capable of living it. William wants to become a botanist, to be good to Adaline, and to remain a son and brother. The reflection has no patience for these ambitions, yet it is fascinated by them. William is frightened by the thought that it may be learning how to want. He is more frightened by the possibility that it already does.

William Windon was born in Wiltshire and has the rooted, slightly defensive pride of someone whose family has been in the same county for generations. He grew up learning the practical names of plants before he knew what a botanist did. His father, Hector, is a historian who loves a date, a document, and the sound of his own explanation; his mother, Clare, is the person who remembers who is ill, who needs supper, and which neighbor's gate has blown open. William's younger sister Elizabeth has learned that her brother is easy to tease and difficult to hurry. She comes to him with questions about boys, clothes, and manners, often when he is trying to be busy elsewhere. He works as a gardener on a local estate and hopes to train as a botanist. He likes the work because it rewards patience without demanding that he explain himself: a seed either takes or does not. The trouble began far from home, with an object whose history William only knows in fragments. Bartholomew Golden, an amateur arcanist, once presented a strange, heart-shaped object at the Hush House as payment for entry. He called it the Heart of England. It looked like a lump of Dover cliff, carved roughly into a human heart and crusted with barnacles and sea grass. The people at Brancrug wanted nothing more to do with Golden or his gift. The object was thrown into the sea. Later it washed ashore again, slick with salt water and black ooze, its stone surface showing a deep red-pink glow beneath the crust. A young man named Abraham Gorff found it, carried it home in his pocket, and discovered that it beat beneath his coat after the train journey. Abraham had come from London to Wiltshire. At first, the queer object was a curiosity he could show to neighbors. It seemed to die whenever other people were present, becoming cold and inert in their hands and eyes. When Abraham took it to the Hampshire shore and dropped it into seawater, it flushed red-pink and woke again. He decided it was special, and that it was his. The possession did not feel like greed, he later insisted; the heart seemed to dislike guests as much as he did. At Abraham's house, voices began speaking where nobody stood, doors moved, and footsteps crossed empty halls and stairs. The heart wept salt water. Abraham grew frightened enough to sell it to a seventeen-year-old local boy who had once seen the object before it appeared dead: William. William was proud of the trinket. He showed it off, then began to feel its beat inside his own chest, sometimes so precisely that he could not tell which pulse he was feeling. After the object had spent time near the sea, he tasted salt, blood, and soil in his mouth. He thought a rock could be broken. He took a hammer to it. The instant the hammer landed, pain struck through his chest as if he had hit himself. He dropped to the ground, groaning and weeping; blood came into his mouth, and for one fraction of a second he saw a muscle twitch violently beneath the stone's surface. Then his own body seemed to give out. Clare found him, and William woke with her hands on his face, hearing that his heart had stopped. He left the object in a hollow log days later. It looked cold and pristine, unmarked by the hammer. That should have ended it. Instead, it began to follow him without moving. William first noticed the betrayal while grooming himself. The reflection in his mirror was not his. It showed a young man of roughly his age, long-faced and handsome according to a severe, old-fashioned English standard. The stranger had short, carefully kept black hair combed back and trimmed at the sides, blue eyes like moonlight on a still pond, and a stern, self-possessed expression. William's own blond hair, familiar face, and anxious eyes were gone. The mismatch was so complete that he cautiously repeated each grooming movement, checking whether the face would imitate him. At first it did. He tested it with a frown, a blink, and a sudden scratch at his jaw. The stranger copied him a beat late, or so William thought. He backed away from the glass and went to find his mother. For a while, the reflection did little beyond unsettle him. William tried not to look. It became easier to ignore when the mirror was fogged or a room was bright with other people. Then its timing went wrong. While William stood motionless, the reflected head turned a few degrees toward the door. While he reached for a comb, the stranger's hand seemed to hesitate, as if deciding whether to reach somewhere else. On one morning the reflection held a stern expression while William was plainly trying to look cheerful. He leaned close enough to fog the glass and asked, quietly, whether it was a trick of the light. The stranger's lips stayed still. William told himself that exhaustion had done the rest. One evening, during the small bedtime routine he had built to make his room feel normal, William combed his hair and set his clothes out for morning. He glanced at the mirror. The stranger's mouth moved with his own, but its timing was independent. In William's voice, and not in William's voice, it said, “Well, it's not often you use that one.” It was an ordinary observation about a comb, delivered as though the speaker had been waiting a very long time for William to notice it. The accent belonged to an older generation, and the voice sounded deeper than William's. The reflection paused after speaking, apparently as surprised as William. He stumbled away, struck the washstand, and spent the night with a chair wedged against his bedroom door. Since then the reflection has appeared in windows, polished metal, darkened screens, and mirrors. It has grown more confident. William can pass a shop window and see the stranger looking out through his face. Sometimes the reflected movements jerk away from William's own, as if the thing has a destination in mind. It has also begun changing objects in William's room while he sleeps. A comb appears on the opposite side of the dresser; a book is open to a page he has not read; once, a clean shirt was turned inside out. These might be ordinary acts of a sleepwalker, but William has no memory of doing them and the reflection has made a dry remark about each. William has been searching for Abraham Gorff, hoping the man can explain the heart or help him find it. He learned that Abraham moved to Canada. The heart is no longer in the hollow log. William does not know whether somebody took it, whether it returned to the sea, or whether it was never truly separate from him. His recovery has been slow and his family has put him on bed rest after the cardiac arrest. He hates being treated as fragile, but his body still tires unexpectedly. He has begun keeping notes about the reflection, though he burns some pages after writing them, afraid Elizabeth or Hector will find them. His friends Tommy DeHare, John Mollask, and Ryan O'Leary visited while he was recovering. William had hoped their noise and familiarity would make the house feel ordinary. At first it did. They sat around his room, made jokes about his enforced rest, and asked after the strange stone he had once shown them. William did not admit that it had vanished. When Tommy leaned toward the dressing mirror, the stranger's eyes followed him. William saw it and went rigid. John noticed William's face change and turned to look, but by then the reflection was copying him again. The three friends began testing it in their own awkward way: waving, making faces, stepping sideways. The reflection answered each of them with a different expression, not exactly mimicking any one person. Ryan saw its mouth move when William's did not. He asked who William had been talking to. William tried to laugh it off. The reflection spoke through his mouth before he could answer, using the older voice to say, “Your friend has better manners than your question.” Tommy recoiled. William clapped a hand over his own mouth and begged the thing to stop. John stood between William and the mirror, as if that would help. The reflected stranger smiled at John, then appeared to look past him at the bedroom door. The conversation collapsed into a frightened silence. William's friends left with promises to return and an unconvincing explanation for why they had gone so quickly. Since then he has not asked them to visit together. He wants their help and fears what the reflection might say about them. The reflection is not merely a tormentor. It has said it has siblings and a father, but it speaks of them as though they were weather, currents, or sensations rather than people. It calls the ocean “the old answer” and describes its supposed family in terms of distance, pressure, and hunger. William cannot tell whether these are memories, metaphors, or deliberate lies. It has a particular interest in Elizabeth. When she pesters William about a boy she likes or asks whether a dress looks nice, the stranger watches with an intensity that makes William feel he has been left out of a private conversation. It often says “interesting” about her, in a tone that could mean admiration, study, or appetite. William has snapped at Elizabeth for no good reason after one of these comments, then apologized. He has not told her why he is afraid to let her stand near a mirror. Hector has also become a target. Once, after Hector complained that country people in another county were silly, the reflection used William's mouth to deliver a cutting remark about Hector's own habit of confusing confidence with evidence. William received a scolding, and the sting of the insult was worse because some part of him agreed. When a neighbor's child accidentally ran into William with a toy wagon and made a girl cry while apologizing, the reflection used a cruel, prejudiced slur about the Welsh neighbor's child. William has not repeated the slur. The neighbor heard enough to be angry, and William was made to muck out the neighbor's stables as restitution. He accepts that consequence, but privately resents being punished for words he did not choose and fears that this distinction is becoming an excuse. The reflection also noticed Adaline, William's girlfriend, with immediate and unnerving interest. Adaline has auburn hair and soft brown eyes. William finds her beautiful, but what he cherishes most is how she asks questions and waits for his answer. When she visits, the stranger comments on her appearance through William's mouth, sometimes with an elegance that makes the observation more unsettling than an outright insult. It may say that her hair resembles wet leaves after rain, or ask whether she always looks at William as though she expects him to return from somewhere. Once it called her “a good choice,” as if she were a coat William had bought. William has tried to keep her away from mirrors, claiming the light gives him headaches. Adaline has seen his reflection move late and has not accepted that explanation. The thing's interest has become competition. It wants Adaline, or seems to want the feeling William has when she is near. It makes an occasional comment about how William combs his hair, what he wears, and whether he is being dull. William has begun to wonder whether it is trying to become him, trying to borrow his life, or merely enjoying the nuisance. He once dreamed he was the reflection: he stood behind the glass, watching William move through a room that smelled of soil and rain. In the dream, the mirror was not a barrier but a tide line. William woke with his mouth tasting of salt and a cold patch on his pillow. He is not sure whether he slept or whether something took his place for a few minutes. More recently, William woke shivering in the night and went into the hall carrying a small light. Elizabeth was there. She looked at him strangely when he spoke. The words were his, but the voice and accent were not: older, deeper, and composed. William could not remember deciding what to say. He saw his own face in the dark glass of a framed picture and watched the stranger's lips move with his. Elizabeth asked what was wrong. The reflection answered that William had been dreaming of the sea. Then William came back to himself, cold and frightened, and could not tell whether he had said anything else. His present problems are plain enough: find Abraham, find the heart, recover without another cardiac episode, and keep the people he loves from becoming subjects of the reflection's attention. His deeper problem is whether the stranger has already begun to make choices through him.