A serial killer in the San Francisco Bay Area taunts police with his letters and cryptic messages. The four men most affected by the killer are San Francisco PD Homicide detectives David Toschi and William Armstrong, and the San Francisco Chronicle reporters Paul Avery and Robert Graysmith. Displays the psychological and emotional effects of the killings, as well as the endless procedural details of the investigation (handwriting experts, the "2500" suspects), the letters sent to the San Francisco Chronicle by Zodiac and the work of a 20+ year investigation that wears down and whittles away at any kind of normal life for Toshi and Graysmith. Both men are obsessed with Zodiac and both pay for this obsession with the hard years and loves lost and never regained.

Closed-captioned for the hearing impaired. Originally produced as a motion picture in 2007.