David Fincher’s Zodiac is the finest film he has ever brought us, and one of the most gut churning documentations of a serial killer’s crimes ever put on celluloid. Fincher has no interest in fitting his narrative into the Hollywood box or sifting through the details of the real life crimes to remove anything that doesn’t follow established formula. He plumbs the vast case files and sticks rigidly to detail, clinging to ambiguity the whole way through and welcoming the eerie lack of resolution we arrive at with open arms. That kind of diligence to true life events is far more scary than any generic, assembly line plot turns twisted into stale shape by the writer (and studio breathing down their neck, no doubt). No, Fincher sticks to the chilling details religiously, starkly recreating every revelation in the Zodiac killer case with the kind of patience and second nature style of direction that leads to huge atmospheric payoff and a hovering sense of unease that continues to make the film as effective today as the day it was released. A massive troupe of actors are employed to portray the various cops, journalists, victims and pursuers involved with the killer during the 1970’s in San Francisco, the film unfolding in episodic form and giving each performer their due, right down to the juicy cameos and bit parts. Jake Gyllenhaal plays Rob Graysmith, a news reporter who becomes intrigued and eventually obsessed with the cryptic puzzles which the Zodiac taunts the bay area with by sending them in to the paper. Mark Ruffalo is Charlie Toschi, dogged police investigator who is consumed by the hunt. The third leg of the acting tripod is Robert Downey Jr as Paul Avery, another journalist who takes the failure in capturing the killer a little harder than those around him. The film dances eerily along a true crime path populated by many people who veered in and out of the killers path including talk show host Melvin Belli (a sly Brian Cox) , another intrepid cop (Anthony Edwards), his superior officer (Dermot Mulroney) and so many more. For such an expansive and complicated story it’s all rather easy to keep track if, mainly thanks to Fincher’s hypnotic and very concise direction, grabbing you like a noose, tightening and then letting you go just when you feel like you have some answers. While most of the film examines the analytical nature of the investigation, there are a few scenes which focus on the killings themselves and let me tell you they are some of the most hair raising stuff you will ever see. The horror comes from the trapped animal look in the victims eyes as they try rationalize the inevitability, with Fincher forcing you to accept the reality of such acts. One sequence set near a riverbank veers into nightmare mode. Every stab is felt by the viewer, every bit of empathy directed to the victims and every ounce of fear felt alongside them. It can’t quite be classified as horror outright, but there are scenes that dance circles around the best in the genre, and are the most disturbing things to climb from the crevice of Fincher’s work. They’re nestled in a patient bog of studious detective work, blind speculation and frustrating herrings, which make them scarier than hell when they do show up out of nowhere. Adding to the already epic cast are Jimmi Simpson, Chloe Sevigny, Elias Koteas, John Carroll Lynch, Donal Logue, Pell James, Philip Baker Hall, John Terry, Zach Grenier and a brief cameo from Clea Duvall. I think the reason the film works so well and stands way above the grasp of so many other thrillers like it is because of its steadfast resolve to tell you exactly what happened, urge you to wonder what the missing pieces might reveal should they ever come to light, and deeply unsettle you with the fear of the undiscovered, something which never fails to ignite both curiosity and dread in us human beings.