Zodiac

Zodiac is a non-fiction book written by Robert Graysmith about the unsolved serial murders committed by the "Zodiac Killer" in San Francisco in the late 1960s and early '70s. Since its initial release in 1986, Zodiac has sold 4 million copies worldwide. Graysmith was a cartoonist for the San Francisco Chronicle and later also wrote Zodiac Unmasked.