Sometimes, an entire case balances on a single grain of sand. Past midnight, in the sterile silence of an evidence room, a lab tech shakes out a car’s floor mat. Dust and grit whisper onto a steel tray. But under the hum of fluorescent lights, one speck gleams the wrong color—a tiny anomaly. It’s a clue that points not to the victim’s home, but to a distant construction site. It is the kind of ...
