Zodiac

About the film

Contains story spoilers.

Zodiac follows the investigation of a real series of attacks in Northern California, but its story is also about the people who remain caught in the search. It begins on July 4, 1969, when a gunman attacks Darlene Ferrin and Mike Mageau in Vallejo; Mageau survives. A month later, the San Francisco Chronicle receives encrypted letters from someone calling himself Zodiac and threatening further killings unless the paper publishes his message. Political cartoonist Robert Graysmith recognizes that the first cipher does not appear to reveal the killer’s name, though the newsroom initially gives his insight little weight.

The Chronicle’s crime reporter Paul Avery becomes more interested as Graysmith helps interpret the letters. The killer’s correspondence keeps the murders in public view while providing clues that may or may not lead anywhere. In September, law student Bryan Hartnell and Cecelia Shepard are attacked at Lake Berryessa; Shepard dies two days later. In October, taxi driver Paul Stine is shot in San Francisco’s Presidio Heights, and the killer sends pieces of his bloodstained shirt to the newspaper. The case now crosses jurisdictions, and inspectors Dave Toschi and Bill Armstrong work with investigators in Vallejo and Napa.

The film moves between police work and newsroom life rather than giving one investigator a simple, uninterrupted route to the answer. Graysmith and Avery develop an uneasy professional connection; Avery’s proximity to the case brings him a threat that contributes to his growing paranoia and substance use. Toschi and Armstrong contend with a case that never settles into a routine. A caller claiming to be Zodiac speaks with lawyer Melvin Belli on a television program, adding another spectacle without resolving who is behind the killings. Each new letter draws attention back to the case but also adds noise and uncertainty.

Arthur Leigh Allen becomes one of the suspects the investigators examine. Toschi notices Allen’s Zodiac-branded watch and believes he may be the killer, but a handwriting expert says Allen did not write the letters. The film does not treat this evidence as a clean solution. Graysmith’s own inquiry gathers circumstantial details that seem suggestive, including Allen’s proximity to Ferrin and a birthday that matches information connected to one call. Yet handwriting and fingerprint evidence do not implicate Allen. The tension comes from how a pattern can feel persuasive while still falling short of proof.

As the years pass, the work pulls people away from ordinary life. Avery moves to another paper and becomes increasingly consumed by the case. Toschi faces the pressure of a mystery that follows him beyond work. Graysmith keeps contacting the police and slowly earns Toschi’s respect for his knowledge, even though Toschi cannot simply give him access to the evidence. After Armstrong transfers and Toschi is demoted over an allegation that he forged a Zodiac letter, the official investigation is no longer a stable partnership. Graysmith continues building his own account, eventually writing a book about the case.

That pursuit costs him. Graysmith’s obsession deepens, and his wife Melanie leaves with their children. He loses his job and begins receiving unnerving calls from someone breathing heavily. The film connects these intimate losses to the larger investigation without claiming that every fear or coincidence confirms the killer’s identity. In 1983, Graysmith tracks Allen to an Ace Hardware store in Vallejo. They look at each other, but the encounter does not turn into an arrest or confession. The scene offers proximity instead of certainty, which is exactly what the larger case has repeatedly denied.

Years later, Mike Mageau reappears and identifies Allen from a police mugshot. An epilogue notes that Allen died in 1992 before police could question him, that a 2002 DNA test did not match him, and that authorities did not rule him out. The film closes with the case still open. That boundary matters: its dramatic focus falls on Graysmith’s long pursuit and the suspicion surrounding Allen, while the real Zodiac killings remain unsolved. The ending leaves the viewer with an identification, a set of conflicting clues and no final proof that the mystery has been settled.

The movie’s long span of years gives it a different rhythm from a conventional chase story. Instead of compressing the case into one escalating week, it returns to the investigators and the Chronicle as time changes their jobs and relationships. Letters and ciphers are not magic keys; each discovery can narrow a question while leaving the central one unanswered. Graysmith’s work moves from newsroom curiosity into a private fixation, and the film shows that shift through the time he spends away from his family as much as through the details he collects. Because the story concerns real crimes, its ending keeps the difference between a persuasive cinematic account and a proven identification in view. Allen remains the focus of suspicion in the film, but that is not the same thing as a solved case.