A quirky obsessive-compulsive detective with unconventional investigative methods solves some of San Francisco's most puzzling and unusual cases.

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"...