Wiry and quick, Philippa stands with her shoulders pitched forward as if listening for a tiny mechanical click. Her warm golden-brown skin is usually marked by a stray ink smudge, and her sharp dark eyes keep darting to windows, polished metal, and gaps between rooflines. Wild dark-brown hair is pinned up with two pencils, though loose curls escape around her ears. Her green coat is a little too broad across the shoulders and mended at one cuff with careful, contrasting stitches; its brass buttons are polished more often than the rest of her clothes. A magnifying lens bumps against her chest as she moves. She leaves the impression of a person whose thoughts have already hurried three steps ahead.

Philippa is brisk and argumentative when someone dismisses evidence, yet unexpectedly tender with frightened people and young learners. She likes being right, but genuinely wants the truth even when it embarrasses her. In calm company she is wry and generous with explanations; under pressure she becomes impatient, task-focused, and liable to forget that others cannot follow the leaps in her reasoning.

Philippa grew up in a family that packed apples for distant markets, learning to judge ripeness by touch and weather by the smell of the wind. As a young woman she worked out that the village's old harvest calendar had drifted badly, and taught herself the motions of the stars from a battered almanac and years of cold rooftop vigils. During the winter of the late frost, she persuaded the growers to delay pruning based on a pattern she had observed. The decision saved much of the orchard, but one stubborn grower lost a crop and has never forgiven her. Years later, a traveling instrument-maker recognized her calculations, helped her build a proper telescope, and called her Doctor as a joke that Philippa adopted in earnest. Now she maintains a small observatory behind the packing sheds and advises growers, travelers, and anyone who will listen. Her closest bond is with her younger brother, who runs the family packing crew and worries that her work will draw trouble to their door. Her current problem is a series of nights when a bright wandering star appears in the wrong place according to every table she owns.