Army Captain Colter Stevens is embarking on a special program that allows his consciousness to be implanted into another human being. The only catch is that you can only be there for 8 minutes at a time. A bomb exploded on a commuter train just outside Chicago that morning. He takes over the body of a teacher on his way to work on that train, unsure of what he is doing or why he is there, as his last recollection is of flying his helicopter on a combat operation in Afghanistan. The program’s administrators inform him that there is a bomb aboard the train and that he must discover it. More importantly, he must identify the bomber because another attack is scheduled for later that day. However, he is also informed that he cannot change the past and can only acquire knowledge. As he grows fond of his traveling partner Christina, he decides to put that hypothesis to the test.