Project "Source Code" is a government secret project designed to prevent terrorist attack from happening. Captain Colter Stevens was part of this project, wherein they are able to make him crossover to another person's identity during the last 8 minutes of that man's life. Each time, he must try to study and determine who will be responsible for the crime.

Source Code movie trailer HD

As another reported bombing incident that is about to happen, he must race against time in order to identify the people behind it, and to ultimately prevent it from happening.