The "source code" is a program that allows you to become implanted in the body of a man in the last eight minutes of his life, to use it to restore all the events of this period of time to the last detail. In commuter train bound for Chicago, terrorists detonated a bomb. All the passengers were killed. The Government is aware that the next blast will be even more powerful. Captain Coulter Stevens, with a program that embodies the body of Sean Fentress, who was riding the train exploded. Coulter’s task is to find the bomb, the terrorist, and the way to calculate the detonation time. In addition to this mission there are a personal motivation appears. The fact is that once in the Sean’s body, he fell in love with a fellow traveler Christine and he really wants her to stay alive.