In the summer of 1969, the Bay Area was rocked by a string of mysterious murders—then came the letters. In this episode, we dive into the moment the Zodiac Killer introduced himself to the world with a 408-symbol cipher and a chilling confession. From newsroom chaos to amateur codebreakers racing to crack the puzzle, we explore how a killer used ink and fear to grip an entire region—and why his words were just as dangerous as his bullets.

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