In the near future, technical genius Ken Custer (Michael C. Hall) invented nanotechnology that implants command cells into the human brain. Based on this, Custer developed two real-life online control games - "Society" and "Murderer". The "Murderer" puts death row prisoners into a cruel killing battlefield, and offline players command them to fight. Cabell (Gerard Butler) is a perennial fighter in the murderer game. He has survived 27 games so far, and according to the rules, as long as he wins three more times, he can regain his freedom. A resistance organization is secretly planning to overthrow the wealthy Custer. They find Cabell's offline partner in the game - the teenager Simon (Gerard Butler), and hope that he will give up his control over Cabell because the latter is about to face Custer's conspiracy. At this time, Cabell has become the key force to overthrow Custer...