Once: 25 Double passes to 'Zodiac' to be won from Chaos
"From 1966 to 1978, the Zodiac Killer claimed victim after victim in the San Francisco Bay area, repeatedly taunting law-enforcement authorities with direct messages bragging about his deeds. The killer is officially blamed for six murders but claims to have killed 37 people. Some believe he could have have been responsible for as many as 50 deaths. When Zodiac starts killing again, the son of the broken journalist who tracked his every move and the retired cop who never caught him, continue the search for the murderer."
All you need to do to enter is tell Chaos who wrote the book 'Zodiac'