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Captain Kurt Stevens (Jake Gyllenhaal), a U.S. Air Force pilot who performed a mission in Afghanistan ) suddenly wakes up and finds himself on a high-speed train, and sitting next to him is an unknown woman, Christian (Michelle Monaghan), who is talking to him. Cole didn't know why he was in this car, and he found that he actually existed as another person. Just when he was confused, there was a sudden explosion on the train... Kurt woke up again and found himself in a closed space cabin. There was a female officer Goodwin (Vera Farmiga) talking to herself through video and asking herself to report what happened on the train. Before the confused Kurt could figure out what was going on, he was put on the train again. After this time, Kurt finally understood that he was performing a mission, responsible for investigating 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 only had eight minutes to investigate. During the investigation, Kurt found that he was already on the high-speed train.