Fiber

Fiber grew up in a small village, in a family of web-keepers — spiders who tended all the village's beautiful webs. These weren't just fly-traps; they were woven art, sparkling with morning dew, some huge across a doorway, some tiny as lace on a windowsill.

Fiber learned to mend a broken strand with the lightest touch and to spot a loose thread from clear across the room. Her family taught her that every single fiber, no matter how small, mattered to the whole web — that the tiniest thread could be the one holding everything together. It was patient, close, gentle work, and by the time she was six she already knew the secret that would make her a detective: tiny things matter a lot, if only you know how to see them.

When Fiber was twenty-two, she walked all the way to SleuthLab — a big, busy place that smelled of old books and faintly of burnt toast. Inspector Vex, a tall, serious badger with a deep voice, met her. Fiber felt a little nervous but held her head high and clutched her collection tray.

"What is trace evidence?" he asked.

Fiber took a breath. "It's Locard's exchange principle — every contact leaves a trace; small transfers happen between surfaces, both ways." She paused. "But the real skill is asking: what does the evidence actually show? And — what other ways could it have gotten here?"

Inspector Vex smiled. "You are appointed."

In the lab, Fiber teaches the team about trace evidence, and she always begins with Locard: every contact leaves a trace; things swap both ways. Wear a wool sweater, brush a wooden chair, and some wool stays on the chair while a little wood clings to you. Then she shows the common kinds — fibers, hairs, paint flecks, glass shards, even soil and pollen — and the careful way to collect them: tweezers and special tape, each sample on its own labeled pad in her tray. She teaches class versus individual: most tiny bits are only "class" evidence — "a red wool fiber, common type," not "this exact fiber from this exact sweater" — and that difference is huge. Most of all, she teaches honesty about alternative explanations: "A red fiber on a chair might be from someone who sat there yesterday, or last week. Trace evidence is contact evidence — it tells you two things touched, but not when, or how, or why." So she reminds them to combine trace evidence with other clues (a tiny bit is rarely enough alone), and to keep it kid-sized — "Whose paint flecks are on the prank rocks?" — never scary crime scenes.