For seventeen years, bombs mailed to universities and airlines killed three people and injured twenty-three, and the FBI could not identify who was sending them. This National Geographic film reconstructs the case through the people who worked it: the leader of the UNABOMBER Task Force, FBI profilers, the arresting officers, and the prosecutor who eventually took Theodore Kaczynski to trial. Interviews trace how a mathematician with a Harvard degree ended up living without electricity or running water in a remote Montana cabin, building bombs by hand and mailing a manifesto to the New York Times and Washington Post. The break in the case comes not from forensics but from language: Kaczynski's brother recognizes the manifesto's phrasing and turns him in. The film includes people who knew Kaczynski personally, giving the portrait some texture beyond the crime itself, and it stays close to the investigative timeline rather than the psychology, tracking how a search with almost no physical evidence finally closes.