Netflix’s new documentary This is the Zodiac Speaking revisits the mysterious case of the Zodiac killer, who terrorized the Californian coastline in the 1960s and 1970s. Featuring the Seawater family, who intimately knew the police’s chief suspect, Arthur Leigh Allen, the film squarely concludes that Allen was indeed the man known as the Zodiac. The murders were made all the more intriguing by the Zodiac’s use of letters and ciphers, per ciphermysteries.com, which he sent to the police and the media, teasing and taunting them to discover him.