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When a video of a mysterious figure in a dark green hoodie killing two kittens was posted online, the entire internet was shaken. A group of amateur internet detectives began working together to track down the uploader. In a dangerous game of cat and mouse, each click encouraged the horrifying perpetrator to release more unsettling videos, until the final video was uploaded. This time, the victim was human. This is a true horror story, produced by the makers of *Catfish* and *Silk Road*, telling the story of a killer desperate for fame, who broke the internet's first rule: Don't mess with cats.