Captain Kurt Stevens (Jake Gyllenhaal), a U.S. Air Force pilot on a mission in Afghanistan, suddenly woke up and found himself on a high-speed train, and a woman sitting next to him, Christian (Michelle Monaghan), was talking to him. Cole didn't know why he was on this train, and he found that he was actually in the identity of another person. Just when he was puzzled, an explosion suddenly occurred on the train... Kurt woke up again and found himself in a closed space capsule. A female officer Goodwin (Vera Farmiga) was talking to him through video and asked him to report what happened on the train. Before Kurt, who was confused, figured out what was going on, he was sent to the train again. After this time, Kurt finally realized that he was on a mission to investigate the Chicago train bombing to find the terrorists and find out his next target. Kurt was sent to the high-speed train again and again, and each time he had only eight minutes to investigate. During the investigation, Kurt found out that he had died a week ago. It turned out that he was participating in a secret mission of "brainwave original code". This mission restored the events and investigated the truth of the matter through the brain cell images of Kurt who had died but not completely died. In the end, Kurt successfully completed the mission, but he decided to return to the train again to save the innocent lives on the train...