Why Was Zodiac Killer's Case So Fascinating To Investigators?

In the late 1960s and 1970s, fear grips the city of San Francisco as a serial killer called Zodiac stalks its residents. Investigators and reporters become obsessed with learning the killer's identity and bringing him to justice. Meanwhile, Zodiac claims victim after victim and taunts the authorities with cryptic messages, cyphers and menacing phone calls.
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