Last week we left you with the absolutely massive cliffhanger of a 408-character cipher, which in theory contained valuable information on the Bay Area’s most infamous killer “The Zodiac”. But first it needed to be solved. And amazingly it wasn’t cracked by the police, or the FBI: it was solved by a 41-year-old history teacher and his wife, and we’re going to tell you exactly how they did it. 

In this week’s episode, the Zodiac’s killing spree continues – claiming the lives of young lovers Bryan Hartnell & Cecelia Sheppard, along with San Francisco Taxi driver Paul Stine – while the police work furiously to beat the cyphers, and uncover his identity once and for all.

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