Files don’t sit still—they accrete. Part III follows the case beyond night and first weeks into the slow machinery of later years: handover teams with new remits, specialist dogs and what an “indication” can (and cannot) say, targeted lab work and the limits of testing long after the fact, and re-interviews that tighten verbs and minutes rather than conjure revelations. We trace public appeals 2.0—age progressions, e-fits, reconstructions—and the back-office discipline that turns attention into a single new anchor. We re-test the geometry of the hour with walk-times, sightlines, noise checks, and vehicle feasibility; and we explain the legal quiet around cross-border cooperation and publicly named lines of interest. No shortcuts: just what the tools did, what they couldn’t, and the handful of real triggers that could still move the file—new anchor, corroborated witness, or forensic re-analysis. The hour doesn’t get bigger; the work gets sharper.