Jackson Dahl reads crime scenes the way an engineer reads a failed system. He doesn't look for clues; he looks for the broken part — the anomaly in behavior that tells him who was there, and what they could not stop themselves from doing.

Five years with the FBI Behavioral Analysis Unit at Quantico, under NCAVC. Victimology and serial predation. Daily access to ViCAP for cross-jurisdictional pattern matching. He left the Bureau after a profile he wrote got weaponized by politics — a “Bad Data” case the Office of Professional Responsibility was not built to address honestly.

He is now a licensed PI, State of Michigan, working cold cases out of a converted cinder-block garage in Dry Creek. His cases come through Deputy Tom “Hendo” Henderson of the Sanilac County Sheriff's Department — off the books, outside jurisdiction, for situations the law can touch but not quite reach. He does not advertise.

Dahl carries an engineer's vocabulary into a profiler's work. The translations stuck.