A double homicide in 1998 could have gone cold—but investigators in southeast Missouri refused to let the Scherer case fade. This episode follows the exhaustive, multi-state search for a suspect, the early warning signs of a traveling predator, and the breakthrough that finally came with new DNA testing and a CODIS match linking Missouri to a 1990 murder in South Carolina. The trail points to a violent criminal who disappeared in plain sight.... and whose story is only beginning to surface.