A cartoonist teams up with an ace reporter and a law enforcement officer to track down an elusive serial killer.
- Genre: Crime, Drama, Mystery, Thriller
- Studio: Paramount, Warner Bros. Pictures, Phoenix Pictures
- Keyword: california, san francisco, california, killing, journalist, newspaper, 1970s, victim, code, investigation, police, murder, serial killer, crime scene, reporter, whodunit, young man, fourth of july, newspaper article, 1960s, zodiac killer, san francisco, young girl, young girls, california, usa, psycho california, san francisco california, usa, san francisco, usa
- Cast: Robert Downey Jr., Mark Ruffalo, Jake Gyllenhaal, June Diane Raphael, Anthony Edwards, Ciara Hughes