[5] Jake Gyllenhaal, Mark Ruffalo, and Robert Downey, Jr. star in David Fincher’s film about the investigation of the so-called ‘Zodiac’ killer in the late ’60s through the early ’80s. Downey and Gyllenhaal’s characters work for the San Francisco Chronicle, which begins receiving letters from the killer. As he seeks fame in the press, Ruffalo and Anthony Edwards are the cops who try for years …