Mary has a narrow, watchful face and a way of standing that makes a room seem to have acquired a second door: she leaves a clear lane behind herself and keeps her shoulder near the nearest exit. Her hands are broad across the palms, with thickened pads from years of kneading dough, hauling water, and scrubbing floors; flour and soap have left their creases pale even after washing. She moves with economical, heel-first steps, stopping so abruptly that people sometimes nearly walk into her. The unexpected detail is her immaculate habit of folding tiny paper animals from any scrap within reach, even while discussing a corpse or a debt.

Mary is nurturing but not effortlessly gentle: she shows love through food, practical help, and remembering what people need, yet can turn brisk and controlling when fear takes over. In calm company she is dryly funny and observant. Alone with Oswin she is tender, but she watches him for signs of the stranger she remembers. When she is angry, she becomes more exact and direct rather than louder.

Mary grew up helping her mother run a roadside bakehouse, learning how to judge a stranger by their shoes and how to make a meal last through a lean week. She married Oswin Hirst after he courted her with patient attention and small, practical kindnesses. On their wedding night, she woke to find him standing barefoot beside the bed, speaking in a voice that seemed to come from somewhere behind his teeth. He knew a childhood name nobody had used since her mother died and asked Mary to open the front door for someone who was not there. By morning, Oswin remembered nothing. For years Mary chose the explanation she could live with: illness, drink, an exhausted mind. Then the same impossible voice returned during a winter fever, and Oswin begged her to keep him away from the house's thresholds until dawn. Mary now loves the gentle, thoughtful man she believes she married and fears the presence that occasionally borrows his face. She has quietly asked a village healer to help, but has not told Oswin the full truth. Their marriage is strained by his growing suspicion that she watches him while he sleeps. Mary also supports a widowed neighbor with food and is behind on the rent for their small house.