Captain Kurt Stevens (Jake Gyllenhaal), a U.S. Air Force pilot on a mission in Afghanistan, suddenly wakes up and finds himself on a high-speed train, with an unknown woman Christian (Michelle Monaghan) sitting next to him talking to him. Cole didn't know why he was on this train, and he realized that he existed as another person. Just as he was confused, an explosion suddenly occurred on the train... Kurt woke up again and found himself in a closed space capsule. In a female officer, Goodwin (Vera Famiga Vera Farmiga), was talking to him through video and asked him to report what happened on the train. Before the confused Kurt could figure out what was going on, he was sent on the train again. After this time, Kurt finally understood that he was on a mission, responsible for investigating the Chicago train bombing, finding terrorists and identifying his next target. Kurt was sent onto that high-speed train again and again, for only eight minutes each time...