While the police, the FBI, the U.S. Navy, and random civilians try to break the code of the killer’s cipher, the killer sends another letter to the press. He gives himself a name, the Zodiac, and taunts the police departments that are unable to catch him. Within a few days, a pair of teachers break the code of the Zodiac’s cipher and reveal the twisted ramblings of a killer. Meanwhile, the Zodiac prepares for his next crime.

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