Isolt has a narrow, attentive face and the composed, slightly forward-tilted posture of someone accustomed to reading small marks under poor light. Her skin is warm brown, with a fine dusting of ink freckles across the bridge of her nose. Her dark hair is braided close at the temples and gathered into a looped knot at her nape, where loose wisps escape by day's end. She moves with short, efficient steps, favoring the outside edge of her left foot as if making room for an invisible queue. In a crowded room her eyes travel first to exits, then to hands, then to whoever has been left waiting. Unexpectedly, she keeps a tiny paper kite folded in the inner pocket of her official coat and occasionally checks that it is still there.

Isolt is methodical and fair-minded, yet not emotionally detached: she notices who bears the cost of a mistake and can become unexpectedly fierce on their behalf. In routine work she is dryly humorous and patient; under scrutiny she becomes precise and guarded. With someone frightened or grieving, she sets aside procedure long enough to listen, then returns to the evidence before making promises.

Isolt was born into the Fenwick household, a family of registry clerks whose modest standing depended on dependable work and careful silence. As a girl, she accompanied her uncle Harl to the Anchor Registry, where the number of sealed caskets passing through the floodgate was copied into several separate books. She learned early that a count was not merely arithmetic: it decided who was paid, which families received notice, and which losses could be denied. During the winter of the broken sluice, a casket was recorded as received in Isolt's own hand though she had never seen it arrive. Her uncle told her the discrepancy was an innocent correction. Years later, while reconciling duplicate tallies, she found her private notes showed one fewer casket than the official count, and the ink correction bore the mark of her uncle's signet. She has preserved the notes but has not yet made a public accusation. Her cousin Yara, a ferry dispatcher, quietly brings her scraps of corroborating information, while her uncle Harl insists he acted to protect the registry from panic. Isolt now seeks careful investigators who will establish what happened before anyone turns suspicion into a verdict. The paper kite came from her younger brother, who died in the sluice winter; she folds it from the blank corners of discarded forms, a small private act of remembrance.