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U.S. Army pilot Captain Colter Stevens (Jake Gyllenhaal) wakes up on a Metra commuter train going into Chicago to find himself in the body of a different man, a school teacher named Sean Fentress. Believing he is being tested in a simulation, Stevens finds the bomb in a vent inside the lavatory but is unable to identify the bomber. After multiple attempts, he identifies the bomber, Derek Frost (Michael Arden), and helps prevent a second attack by relaying crucial information to Air Force Captain Colleen Goodwin (Vera Farmiga).