Ted Crawford is a wealthy brilliant and meticulous structural engineer who lives in Los Angeles. He shoots his wife and entraps her lover. After the police arrive he signs a confession. At his arraignment he asserts his rights to represent himself and asks the court to move immediately to trial. The prosecutor is Willy Beachum a hotshot D.A. who is getting ready to leave for a civil-law firm. He is told by everyone the case is open and shut. Crawford however sees Beachum's weakness - the hairline fracture of his character.