The beginning of the Unabomber's campaign of terror from 1978 to 1985; a look into his childhood to discover what might have turned a young mathematical genius with few friends into a sociopathic terrorist.

From 1985-1993, the Unabomber began to ramp up his terror campaign; secret journals from his time as a grad student in Michigan reveal the moment when Kaczynski's thoughts first turned to murder.

From 1993 to 1996, the Unabomber held America to ransom with a series of increasingly powerful bombs until his arrest; Kacynzki's brother and sister-in-law reveal the emotional story of how they came to suspect he was the Unabomber.

At Kaczynski's trial, it is revealed that as a teenaged student at Harvard, he was subjected to a secret psychological experiment, which some claim could have been responsible for turning him into a terrorist.