Zodiac (2007)

Based on the Robert Graysmith books "Zodiac" and "Zodiac Unmasked" about the real-life notorious Zodiac, a serial killer who terrorised California with a string of seemingly random murders during the 1960s and 1970s. Zodiac taunts the San Francisco police with his letters and cryptic messages. We follow the lives and careers of the detectives and newspaper people as they search for the murderer, each becoming obsessed with the case.

Official website: http://www.zodiacmovie.com/