This is based on the true story of a serial killer in the 1970’s in California who highlighted his murders with cryptic letters to newspapers. He killed at random, and called himself The Zodiac, and wrote his letters in a code. He also often sent bloodstained items of clothes along with these letters as a sort of proof. He was never caught. Robert Graysmith was working as a cartoonist at one of the newspapers where the letters arrived, and became caught up in the case. The film is based on his book of the events of the time.
Brokeback Mountain [based on book]
17 June 2007