A serial killer considers killing humans to be the ultimate game. All that the police know is that he calls himself zodiac, he likes to be in the news and he's quite smart. Inspector David Toschi (Mark Ruffalo) and Inspector William Armstrong (Anthony Edwards) are investigating the case. Paul Avery (Robert Downey Jr.) is the crime journalist assigned this news at his newspaper. Both David and Paul become obsessed with solving the case.

While David almost loses his job, Paul becomes a drunkard and goes nuts, and ultimately loses his job. Robert Graysmith (Jake Gyllenhaal) is a cartoonist at Paul's newspaper and his friend. His interest in solving puzzles gets him involved in the case. After everyone gives up, he takes the responsibility of finding the killer. He loses his job, and his family. But will he be able to figure out who Zodiac is?

Based on the real story of a serial killer who killed people just for fun, and to mess around with the police in the US in 1960s-70s.

Rating: Green - a very well made suspense thriller. Keeps you hooked till the end. Great acting by Jake, Robert and Mark.