THE ZODIAC takes a different look at the famous Zodiac Killer case from other screen treatments of the murders. More than a simple crime story, the film is an emotional thriller focusing on the murders' impact on victims, their families and the wider community. The film follows a police detective (Chambers) and his son (Culkin) who become obsessed with the murders and endanger their family in the process. On 20 December 1968, in Lake Helena, a couple of teenagers is brutally murdered by a killer while dating nearby the lake. The young Sergeant Matt Parish is assigned and becomes obsessed for the case, neglecting his wife Laura and his son Johnny. On 04 July 1969, another couple is shot in the golf course of Vallejo, and the killer sends letters to three newspapers with a riddle and promising more deaths. He kills again, and the police force is not able to arrest him. On 24 April 1978, he writes to a newspaper telling that he is waiting for a good movie about him.