During the day, Thomas is an ordinary 17-year-old boy who goes to high school in Grenaa, but at night he calls himself Le Cerveau and is one of the world's most daring hackers. He looks up to two Danish hackers who have gained access to NASA systems, but soon he himself is on his way even further into the US government's systems and into even deeper water.

Thomas is convinced that UFOs have visited the earth and that the US military is hiding the truth about the visits. Therefore, The Pentagon becomes the target of Thomas' hacking and he takes bigger and bigger risks to achieve his goal. It exceeds the limits of the other Danish hackers, who look askance at the challenging hacker boy.

A simple guess has opened the doors to The Pentagon's systems, but Thomas suddenly finds a series of military secrets that he does not want to keep secret. Soon the scandal rolls in the press, but so does the search for the careless cyber daredevil.