Amelia Lisboa is incriminated for the murder of her husband, Ricardo Lisboa, even though the case was closed for lack of evidence. While hiring detective Cortez to investigate the origin of the blackmail letters, she finds that the detective seems to know more than she reveals. In an allucinating game of lies and seduction, the two woman play their defence. Who is the blackmailer? What is the role of detective Cortez? The shadows of the past challenge the present in a film where the truth is hidden between the lines.