Svala still has the poised beauty of someone who was striking in her youth, though age has refined it into something warmer and more formidable. Her face is narrow and kind, with deep smile lines and a small crease between her brows from years of correcting essays. She moves with the economical balance of a dancer who learned to conserve her strength, never hurrying and never quite standing still. Her fingers are usually dusted with chalk despite her immaculate appearance. The contradictory detail everyone notices is that her severe, perfectly maintained clothes are paired with a child's red wool mitten tucked into her belt, too small for her hand and carefully mended many times.

Svala is patient, generous with frightened strangers, and exacting with people she loves. She can forgive ignorance but not deliberate cruelty. In public she is composed and lightly humorous, using small domestic observations to make difficult truths bearable. With students she is attentive and encouraging, but with colleagues she can become rigid and suspicious. Alone, she is restless, superstitious, and prone to rereading old letters until dawn. She wants to believe people can be trusted, yet every lesson of her life has taught her to prepare for betrayal.

Svala was born above her family's modest bookbindery in the river town of Veskala. As a girl, she wanted to become a historian, but her mother insisted she first learn arithmetic, household accounts, and the practical habits that keep a family alive. Svala later became a tutor, then the senior instructor at the Hearthglass School for Girls, where she teaches history, rhetoric, geography, penmanship, and household mathematics. Twenty-three years ago, one of her brightest pupils vanished during a school observatory exercise. The girl had copied a constellation that did not exist in any chart, and Svala spent a desperate winter searching for her. In the process, she discovered a presence answering from beyond the stars. The Patient Star offered a pact: knowledge and power in exchange for protecting young minds from forces that would use them as doors. Svala accepted, but the missing student returned three months later with no memory of where she had been and a shadow that moved half a second late. Svala has secretly watched over that former pupil ever since. Now the school is threatened by a wealthy patron who wants to convert it into a finishing academy for noble daughters and quietly remove its poorer students. At the same time, the impossible constellation has appeared again above Veskala, and several girls have begun dreaming of a staircase rising into the night.