Ana is a sixteen-year-old daughter of separated parents who was expelled from high school for assaulting a student. Very clever, she often comes into conflict with her teachers. Her behavior makes her lonely until she meets Alex, a manipulative boy of eighteen, the son of a Lebanese father and a Brazilian mother. Alex's hobby is to test the limits of social rules by questioning their values and weaknesses. Together they decide to play a joke on Tristan, a professor of literature and Spanish. He is an Argentinean who was arrested politically during his country's military dictatorship. Now married to Bianca, a depressed woman who has attempted suicide, he experiences a crisis in his marriage. Ana seduces Tristan, meeting that is filmed by Alex. Later, the two threaten to release the video on the Internet if Tristan does not agree to continue the relationship. Thus, other meetings take place on the premises of the college.