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It’s one of the most complex codes in history, which experts say rivals the Rosetta Stone and Enigma in its brilliance. To this day its author is unknown. He’s called Zodiac - America’s most vicious serial killer, who terrorised San Francisco in the late 1960s. Zodiac killed five men and women, leaving behind bizarre ciphers. Now, Sal LaBarbera - the most successful homicide detective in LAPD history - will work with a crack team of codebreakers and FBI investigators to hunt down Zodiac. The key: a groundbreaking new investigative technique called a Double Helix Investigation.


As Sal and his partner Ken Mains uncover new evidence, they’ll feed it to Kevin Knight, who has created a new codebreaking system called Carmel. Carmel will use this new information about Zodiac’s identity - his movements, his behaviour and tactics - to detect new patterns in the Zodiac codes, which will then be fed back to Sal and Ken in the field.