Unsolved and Foundational Investigations

The two landmark cases in this atlas whose offender was never conclusively identified: a nineteenth century case that remains the founding precedent for treating an unidentified offender's identity as a genuinely open question rather than assigning it to any circulated candidate name, and a case investigated for decades using cipher analysis and behavioral profiling that likewise never reached a conclusive identification. Belongs here: a case whose defining fact is that it remains unsolved. Does not belong here: any case in this tree where the offender was eventually identified, however difficult the investigation, grouped by the technique that identified them.