In the quiet hours before dawn, the most important clues make no sound at all. Detective Mara Chen leans over a cold metal table, the relentless hum of fluorescent lights filling the evidence room. Tweezers click. A fresh bag sighs shut. And there, nestled in the groove of a shoe’s heel, is a single flake of sky-blue paint. Under the sterile light, its layered varnish tells an unseen story, whi...
