A serial rapist who marked his victims by branding continued his escalating gravity by committing is presumably first murder. FBI Special Agent Don Eppes is in charge, under Agent Walt Merrick, of a massive investigation. Don's brother, professor Charles 'Charlie' Edward, a mathematical genius, takes a single peek at the map of the thirteen crime locations at their dad Alan's -and still Charlie's- home and claims he can roughly calculate the common point of origin: the rapist-killer's home. Charlie analyzes and applies such variables as the safety zone and the spontaneous non-randomizing of human 'arbitrary' choices, and achieves a 4/5 probability, as tested on earlier serial killers. Charlie's academic friend Dr. Larry Fleinhardt suggests he should concentrate on true mathematical challenges rather than 'trivial' real-life distractions. Charlie's prediction shows 87% chance for a zone with only 75 men, but no judge will grant a search order based on Charlie's work, so DNA is taken from their trash. Charlie then points out the data from victim 12, Karen Silver, is probably wrong because she lied. The correction yields a smaller zone that is 96% precise, within the previous one, where all men were already cleared. The common 'base' is there, only not the perpetrator's home.
—KGF Vissers