Based on "The Eleventh Hour" by Adam Mazer and Bill Rotko and inspired by true events, "Breach" is a dramatic thriller set inside the halls of the FBI - - the gatekeeper of the nation's most sensitive and potentially volatile secrets.
When young Eric O'Neill (Phillippe) is promoted out of his low-level surveillance job and into the headquarters of the Federal Bureau of Investigation, his dream of becoming a full-fledged agent is on the verge of becoming a reality. Even more impressive, O'Neill is handpicked to work for renowned operative Robert Hanssen (Cooper), within "information assurance," a new division created to protect all classified FBI Intelligence. O' Neill is quickly confronted with the true reason behind his hire: Hanssen is the sole subject of a long-term, top-secret investigation, a suspected mole made all the more dangerous by the sheer global import of the information he is charged with protecting.
The Bureau asks O'Neill to use Hanssen's growing trust to slowly draw the traitor out of deep cover. Engaged in a lethal game of spy-versus-spy, O'Neill finds himself fighting to bring down Hanssen before the treacherous double agent can destroy O'Neill, his family and the nation they are both sworn to serve.
Linney portrays Special Agent Kate Burroughs, the FBI staffer in charge of O'Neill, and Dennis Haysbert is Special Agent Dan Plesac, who teams with Burroughs to bring Hanssen down.