Source Code is very well made techno-thriller crisply directed by Duncan Jones (Moon) and expertly written by Ben Ripley. Acting was in the same category and Jake Gyllenhaal, Michelle Monaghan, Vera Farmiga and Jeffrey Wright made the success natural!

Colter Stevens (Jake Gyllenhaal) is a decorated army officer who finds himself in someone else's body on a mission to locate the maker of a bomb which exploded and destroyed a train headed into Chicago. Stevens is isolated inside a chamber, where Air Force Capt. Colleen Goodwin (Vera Farmiga) explains to Stevens through a computer screen that he is inside the Source Code, a program that allows him to take over someone's body in his or her last eight minutes of life.

Unusual story was built up around Stevens' mission to locate the bomb, discover who built it, and report back to Goodwin before the bomber can detonate a second larger bomb, a dirty nuclear device, in downtown Chicago, which could cause the deaths of millions of people. Stevens performs different actions each time and learns from those actions. Goodwin and the Source Code's creator, Dr. Rutledge (Jeffrey Wright), tell him that the Source Code is not a simulation, but a visit into the past in the form of an alternative reality. He's told that he cannot truly alter the past to save any of the engers, but that he must gather intel that can be used to alter the future and prevent a future attack. But he decides to do just that - to alter the event!

Confounding, exhilarating and challenging movie in which Gyllenhaal brings sincerity and warmth to his role while charming Michelle Monaghan makes everything seems real! I enjoyed it!