Plot: Robert Graysmith is a cartoonist who works for the San Francisco Chronicle. His quirky ways irritate Paul Avery, a reporter whose drinking gets in the way of doing his job. The two become friends thanks to a shared interest: the Zodiac killer. Graysmith steadily becomes obsessed with the case, as Avery's life spirals into drunken oblivion. Graysmith's amateur sleuthing puts him onto the path of David Toschi, a police inspector who has thus far failed to catch his man; Sherwood Morrill, a handwriting expert; Linda del Buono, a convict who knew one of the Zodiac's victims; and others. Graysmith's job, his wife and his children all become unimportant next to the one thing that really matters: catching the Zodiac.
Alternative Plot: In the late 1960s and 1970s, fear grips the city of San Francisco as a serial killer called Zodiac stalks its residents. Investigators (Mark Ruffalo, Anthony Edwards) and reporters (Jake Gyllenhaal, Robert Downey Jr.) become obsessed with learning the killer's identity and bringing him to justice. Meanwhile, Zodiac claims victim after victim and taunts the authorities with cryptic messages, cyphers and menacing phone calls.
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